Path Traversal Vulnerability in arben-adm mcp-sequential-thinking
CVE-2026-81845

5.3MEDIUM

Key Information:

Vendor

Arben-adm

Status
Mcp-sequential-thinking
Vendor
CVE Published:
27 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-81845?

A path traversal vulnerability exists in the mcp-sequential-thinking component's import_session/export_session functionality. This issue is due to improper validation of the 'file_path' argument in server.py, allowing attackers to access unintended files on the server. This vulnerability can be exploited remotely, making it critical for affected users to upgrade to version 0.6.0 or later. A detailed patch has been released, addressing the identified issue.

Affected Version(s)

mcp-sequential-thinking 0.1

mcp-sequential-thinking 0.2

mcp-sequential-thinking 0.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-81845 - Proof of Concept

References

https://vuldb.com/vuln/396171
vdb-entrytechnical-description
https://vuldb.com/vuln/396171/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-81845
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mcfly_Zhang (VulDB User)
.