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
Trending — 3 sources updated this weekElevated
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 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 (value × EchelonGraph’s weight)
Severity63% × 45%
The EG Score, 6.3 of 10.
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
40th
KEV
Not listed

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.

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 17× in last 7d / 80× 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 98 of 134 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. 2 repeat rows among the latest 100 are merged into the row they repeat. The 36 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

Related CVEs(same CWE)

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 importsession/exportsession of the file mcpsequentialthinking/server.py of the component Import Session/Export Session. Such manipulation of the argument file_path leads to path traversal. It…
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 (40th 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.

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