CVE-2026-81845

MEDIUMPre-NVD 6.36.3
EchelonGraph scoreMEDIUM confidence

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

Score 6.3 from GitHub Security Advisory (severity: LOW) published 2026-08-28. A secondary CVSS source baseline 6.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Elevated

Also known asEUVD-2026-67291 (ENISA EUVD) · GHSA-j8g6-hw52-mhg7 (GitHub Security Advisories)Source: ENISA EUVD

6.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.5%CVSS: 6.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

A vulnerability has been found in arben-adm mcp-sequential-thinking up to 0.5.0. Impacted is the function import_session/export_session of the file mcp_sequential_thinking/server.py of the component Import Session/Export Session. Such manipulation of the argument file_path leads to path traversal. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 0.6.0 is recommended to address this issue. The name of the patch is 2fad3ee8ab1d0868b6c1afb5895bc336a10e5267. Upgrading the affected component is recommended.

CVSS v3
6.3
EG Score
6.3MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

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)
Severity63% × 45%
Impact severity (EG Severity): CVSS 6.3 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.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
42nd
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 (6.3): severity, escalated by confirmed exploitation. This CVE's 6.3 is its impact severity (EG Severity), not escalated.

EG Severity
6.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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 or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.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 or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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 27, 2026

Last Modified

August 31, 2026

Advisory Details (5)

Auto-updated Aug 27, 2026
Patch available. Sources: github_pr, github_commit, github_release.
Web page

GitHub - arben-adm/mcp-sequential-thinking · GitHub

https://github.com/arben-adm/mcp-sequential-thinking/
GitHub release Patch Available

v0.6.0

Patch available: arben-adm/mcp-sequential-thinking v0.6.0

https://github.com/arben-adm/mcp-sequential-thinking/releases/tag/v0.6.0
GitHub commit Patch Available

commit 2fad3ee8ab1d (arben-adm/mcp-sequential-thinking)

Patch available: arben-adm/mcp-sequential-thinking v0.6.0 (contains commit 2fad3ee8ab1d)

https://github.com/arben-adm/mcp-sequential-thinking/commit/2fad3ee8ab1d0868b6c1afb5895bc336a10e5267
GitHub pull request Patch Available

Fix audit blockers: path traversal, save race, corrupt-file handling + hardening

Patch available: arben-adm/mcp-sequential-thinking v0.6.0 (PR #18 merged 2026-06-13)

https://github.com/arben-adm/mcp-sequential-thinking/pull/18
Web page

[Potential Vulnerability] Arbitrary file read/write via `import_session` and `export_session` in `mcp-sequential-thinking` · Issue #17 · arben-adm/mcp-sequential-thinking · GitHub

https://github.com/arben-adm/mcp-sequential-thinking/issues/17

Vendor Advisories for CVE-2026-81845(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 8× in last 7d / 52× 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 160 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 60 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  4. 2026-10-30 01:55 UTCOSV refresh
  5. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-25 13:58 UTCEG score recompute
  11. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-10-22 13:47 UTCEG score recompute
  15. 2026-10-22 13:47 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  16. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  20. 2026-10-18 03:09 UTCEG score recompute
  21. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
Show 75 more
  1. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-10-12 14:56 UTCEG score recompute
  3. 2026-10-11 19:20 UTCEG score recompute
  4. 2026-10-11 16:36 UTCEG score recompute
  5. 2026-10-11 13:54 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-10 01:44 UTCEG score recompute
  9. 2026-10-10 01:44 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-09 02:54 UTCEG score recompute
  12. 2026-10-09 02:54 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  13. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-08 01:12 UTCEG score recompute
  15. 2026-10-08 01:12 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  16. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  17. 2026-10-06 15:56 UTCEG score recompute
  18. 2026-10-06 15:55 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  19. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  20. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  21. 2026-10-05 16:51 UTCEG score recompute
  22. 2026-10-05 16:51 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  23. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  24. 2026-10-04 16:17 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  25. 2026-10-03 17:34 UTCEG score recompute
  26. 2026-10-03 17:34 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  27. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-10-02 18:50 UTCEG score recompute
  29. 2026-10-02 18:50 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  30. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-10-01 19:52 UTCEG score recompute
  32. 2026-10-01 19:52 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  33. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  34. 2026-09-30 19:53 UTCEG score recompute
  35. 2026-09-30 19:53 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  36. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-09-29 14:32 UTCEG score recompute
  38. 2026-09-29 14:32 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  39. 2026-09-28 15:48 UTCEG score recompute
  40. 2026-09-28 15:48 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  41. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  42. 2026-09-27 17:04 UTCEG score recompute
  43. 2026-09-27 17:04 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  44. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-09-26 18:21 UTCEG score recompute
  46. 2026-09-26 18:21 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  47. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  48. 2026-09-26 15:50 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  49. 2026-09-25 11:43 UTCEG score recompute
  50. 2026-09-25 11:43 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  51. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  52. 2026-09-24 12:09 UTCEG score recompute
  53. 2026-09-24 12:09 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  54. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  55. 2026-09-23 13:25 UTCEG score recompute
  56. 2026-09-23 13:25 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  57. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  58. 2026-09-22 14:41 UTCEG score recompute
  59. 2026-09-22 14:41 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  60. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  61. 2026-09-21 15:47 UTCEG score recompute
  62. 2026-09-21 15:47 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  63. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  64. 2026-09-20 17:03 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  65. 2026-09-19 18:20 UTCEG score recompute
  66. 2026-09-19 18:20 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  67. 2026-09-18 19:37 UTCEG score recompute
  68. 2026-09-18 19:37 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  69. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  70. 2026-09-17 20:53 UTCEG score recompute
  71. 2026-09-17 20:53 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  72. 2026-09-16 19:01 UTCEG score recompute
  73. 2026-09-16 19:01 UTCGHSA enrichmentGHSA-j8g6-hw52-mhg7 · GitHub severity LOW · GitHub CVSS 6.3
  74. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  75. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 26th percentile

Frequently asked(5)

What is CVE-2026-81845?
CVE-2026-81845 is a medium-severity vulnerability; its CVE record was published on August 27, 2026. A vulnerability has been found in arben-adm mcp-sequential-thinking up to 0.5.0. Impacted is the function import_session/export_session of the file mcp_sequential_thinking/server.py of the component Import Session/Export Session. Such manipulation of the argument file_path leads to path traversal.…
When was the CVE record for CVE-2026-81845 published?
The CVE record for CVE-2026-81845 was published on August 27, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of August 31, 2026; the record at its source may have been updated since.
Is CVE-2026-81845 actively exploited?
CVE-2026-81845 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-81845?
CVE-2026-81845 has a CVSS base score of 6.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-81845?
A fix for CVE-2026-81845 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-81845 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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