CVE-2026-61560Public exploitNetwork attack vectorHinoki check available

Unauthenticated file read via unsanitized upload path

Published Sep 15, 2026 · Updated Sep 15, 2026

Path traversal in zereight GitLab MCP Server before 2.1.27 allows remote attackers to read server files through unauthenticated SSE. The upload_markdown tool passes its file_path argument directly to fs.readFileSync, while the SSE endpoints expose the tool without authentication. A network-reachable SSE deployment and writable GitLab project are required; reading /proc/self/environ can disclose the server PAT and grant the token owner's GitLab access.

CVSS severity9.8
Critical
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Path traversal in zereight GitLab MCP Server before 2.1.27 allows remote attackers to read server files through unauthenticated SSE. The upload_markdown tool passes its file_path argument directly to fs.readFileSync, while the SSE endpoints expose the tool without authentication. A network-reachable SSE deployment and writable GitLab project are required; reading /proc/self/environ can disclose the server PAT and grant the token owner's GitLab access.

The record

CVE
CVE-2026-61560
Published
Sep 15, 2026
Updated
Sep 15, 2026
Vendor
zereight
Product
GitLab MCP Server
Classifications
CWE-22, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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=< 2.1.27

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

zereight · GitLab MCP Serverversion=< 2.1.27

Published CVSS scores

9.8GitHub Security AdvisoryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1005Data from Local System

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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