CVE-2026-81845Public exploitNetwork attack vector

Authenticated file read and write via path traversal

Published Aug 27, 2026 · Updated Aug 27, 2026

Path traversal in Arben Ademi mcp-sequential-thinking 0.5.0 and earlier allows remote authenticated users to read and write files. The import_session and export_session tools pass caller-controlled file_path values to file I/O without resolving them against the configured storage directory. Access to an MCP client or a prompt-injected agent is required; reads are limited to usable JSON, while writes and lock files are bounded by server-process permissions.

CVSS severity6.3
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Arben Ademi mcp-sequential-thinking 0.5.0 and earlier allows remote authenticated users to read and write files. The import_session and export_session tools pass caller-controlled file_path values to file I/O without resolving them against the configured storage directory. Access to an MCP client or a prompt-injected agent is required; reads are limited to usable JSON, while writes and lock files are bounded by server-process permissions.

The record

CVE
CVE-2026-81845
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
Arben Ademi
Product
mcp-sequential-thinking
Classifications
CWE-22, T1005, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1
  2. Affected versionversion=0.2
  3. Affected versionversion=0.3
  4. Affected versionversion=0.4
  5. Affected versionversion=0.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Arben Ademi · mcp-sequential-thinkingversion=0.1; version=0.2; version=0.3; version=0.4; version=0.5.0

Published CVSS scores

6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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