CVE-2026-56397

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-21. a secondary CVSS source baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.6Exploit: NoneExposed: 0

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

SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package displayName, description, or README fields, exploiting Electron's nodeIntegration setting to execute OS commands.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity96% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
49.4%
KEV
Not listed

Published

June 21, 2026

Last Modified

June 24, 2026

Advisory Details (2)

Auto-updated Jun 22, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

SiYuan - Remote Code Execution via Malicious Bazaar Package Metadata and README | Advisories | VulnCheck

https://www.vulncheck.com/advisories/siyuan-remote-code-execution-via-malicious-bazaar-package-metadata-and-readme-2
github Patch Available🟡 PoC Available

Remote Code Execution via Malicious Bazaar Package — Marketplace XSS · Advisory · siyuan-note/siyuan · GitHub

https://github.com/siyuan-note/siyuan/security/advisories/GHSA-v3mg-9v85-fcm7

Vendor Advisories for CVE-2026-56397(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
siyuan———

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 164× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 188 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-56397?
CVE-2026-56397 is a critical vulnerability published on June 21, 2026. SiYuan before v3.6.1 fails to sanitize package metadata and README content in the Bazaar marketplace, allowing malicious package authors to inject arbitrary HTML and JavaScript. Attackers can achieve remote code execution on any user browsing the Bazaar by embedding XSS payloads in package…
When was CVE-2026-56397 disclosed?
CVE-2026-56397 was first published in the National Vulnerability Database on June 21, 2026, with the most recent update on June 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56397 actively exploited?
CVE-2026-56397 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 49.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56397?
CVE-2026-56397 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-56397?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56397, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-56397

Explore →

Is Your Infrastructure Affected by CVE-2026-56397?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs