CVE-2026-73056

CRITICALPre-NVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-16. A secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-59942 (ENISA EUVD) · GHSA-v5mj-g3f2-mwr9 (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan mitigationNo fix is confirmed yet: check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

The CVE record's CNA (VulnCheck) lists siyuan-note siyuan versions before 3.7.4 as affected, and siyuan-note siyuan versions 3.7.4 as unaffected. No release containing a fix is confirmed on record.

SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is protected by the application's CAPTCHA/lockout mechanism (NeedCaptcha/WrongAuthCount). As a result, an unauthenticated remote attacker can perform unlimited automated guesses of the API token, particularly when a short or weak custom token has been configured, and upon success gains full RoleAdministrator access enabling arbitrary file operations and SQL queries.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
56th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Check the vendor's advisory for a fixed release; until one is applied, restrict network exposure of the affected system or apply the vendor's mitigation on your normal schedule at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

No released fix is confirmed on this page, but CISA's timeline does not wait for a fix's release: it starts when an agency identifies the flaw on an asset and updates the CDM Agency and Federal Dashboard, and the directive counts patching, decommissioning the system or another action as remediation. Until a fixed release is applied, mitigate as this page's verdict says.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 16, 2026

Last Modified

August 26, 2026

Advisory Details (2)

Auto-updated Oct 31, 2026
🔬 Proof of concept available. No fix on record yet. Sources: github.
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Unthrottled brute-force of `Conf.Api.Token` via header/query auth in `CheckAuth()`, allowing unlimited automated guessing of a weakened API admin token · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-m6w6-p7pc-fpg2
Web page

SiYuan kernel before 3.7.4 Unthrottled Brute-Force via API Token | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-kernel-before-unthrottled-brute-force-via-api-token

Vendor Advisories for CVE-2026-73056(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 94× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 434 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 334 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 19:41 UTCEG score recompute
  2. 2026-11-02 19:41 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  3. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  4. 2026-11-01 19:08 UTCEG score recompute
  5. 2026-11-01 19:08 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  6. 2026-10-31 18:34 UTCEG score recompute
  7. 2026-10-31 18:34 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  9. 2026-10-30 17:56 UTCEG score recompute
  10. 2026-10-30 17:56 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  12. 2026-10-29 17:24 UTCEG score recompute
  13. 2026-10-29 17:24 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  15. 2026-10-28 16:53 UTCEG score recompute
  16. 2026-10-28 16:52 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  18. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  19. 2026-10-27 16:15 UTCEG score recompute
  20. 2026-10-27 16:14 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  21. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  22. 2026-10-26 15:33 UTCEG score recompute
  23. 2026-10-26 15:33 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  24. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.8% · 56th percentile
  25. 2026-10-25 14:36 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
Show 75 more
  1. 2026-10-25 14:06 UTCEG score recompute
  2. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  3. 2026-10-24 14:04 UTCEG score recompute
  4. 2026-10-24 14:04 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  6. 2026-10-23 13:31 UTCEG score recompute
  7. 2026-10-23 13:31 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  8. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  9. 2026-10-22 12:56 UTCEG score recompute
  10. 2026-10-22 12:56 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  11. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  12. 2026-10-21 12:23 UTCEG score recompute
  13. 2026-10-21 12:23 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  15. 2026-10-20 11:51 UTCEG score recompute
  16. 2026-10-20 11:50 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  17. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  18. 2026-10-19 11:17 UTCEG score recompute
  19. 2026-10-19 11:17 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  21. 2026-10-18 08:37 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  22. 2026-10-18 03:15 UTCEG score recompute
  23. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  24. 2026-10-17 07:49 UTCEG score recompute
  25. 2026-10-17 07:49 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  26. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  27. 2026-10-16 07:15 UTCEG score recompute
  28. 2026-10-16 07:14 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  29. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  30. 2026-10-15 06:07 UTCEG score recompute
  31. 2026-10-15 06:07 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  32. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  33. 2026-10-14 01:44 UTCEG score recompute
  34. 2026-10-14 01:43 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  35. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  36. 2026-10-12 21:55 UTCEG score recompute
  37. 2026-10-12 21:55 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  38. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  39. 2026-10-12 15:41 UTCEG score recompute
  40. 2026-10-12 05:44 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  41. 2026-10-11 19:26 UTCEG score recompute
  42. 2026-10-11 16:42 UTCEG score recompute
  43. 2026-10-11 14:02 UTCEG score recompute
  44. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 55th percentile
  45. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  46. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  47. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  48. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  49. 2026-10-07 06:09 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  50. 2026-10-07 02:17 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  51. 2026-10-06 21:55 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  52. 2026-10-06 17:10 UTCEG score recompute
  53. 2026-10-06 17:10 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  54. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  55. 2026-10-06 13:04 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  56. 2026-10-06 09:06 UTCEG score recompute
  57. 2026-10-06 09:06 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  58. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  59. 2026-10-05 17:27 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  60. 2026-10-05 11:59 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  61. 2026-10-05 06:42 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  62. 2026-10-05 01:58 UTCEG score recompute
  63. 2026-10-05 01:58 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  64. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  65. 2026-10-04 21:53 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  66. 2026-10-04 16:26 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  67. 2026-10-04 11:52 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  68. 2026-10-04 07:13 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  69. 2026-10-04 03:22 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  70. 2026-10-03 19:25 UTCEG score recompute
  71. 2026-10-03 19:25 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  72. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  73. 2026-10-03 00:46 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8
  74. 2026-10-02 19:41 UTCEG score recompute
  75. 2026-10-02 19:41 UTCGHSA enrichmentGHSA-v5mj-g3f2-mwr9 · GitHub severity CRITICAL · GitHub CVSS 9.8

Frequently asked(5)

What is CVE-2026-73056?
CVE-2026-73056 is a critical-severity vulnerability; its CVE record was published on August 16, 2026. SiYuan kernel versions before 3.7.4 contain an improper restriction of excessive authentication attempts vulnerability in the CheckAuth() middleware. The middleware accepts the API token (Conf.Api.Token) via an Authorization header (Token/Bearer) or a ?token= query parameter, and neither path is…
When was CVE-2026-73056 made public?
CVE-2026-73056 was made public on August 2, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 16, 2026. EchelonGraph's copy of the record carries a last-modified date of August 26, 2026; the record at its source may have been updated since.
Is CVE-2026-73056 actively exploited?
CVE-2026-73056 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (56th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-73056?
CVE-2026-73056 has a CVSS base score of 9.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-73056?
No fix for CVE-2026-73056 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The CVE record's CNA (VulnCheck) lists siyuan-note siyuan versions before 3.7.4 as affected, and siyuan-note siyuan versions 3.7.4 as unaffected. No release containing a fix is confirmed on record. The vendor advisories EchelonGraph has for CVE-2026-73056 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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