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THREAT OPS › Threat News › [GHSA] GHSA-cv3r-c5h8-f4g5 (critical) — @zereight/mcp-gitlab: Unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover

[GHSA] GHSA-cv3r-c5h8-f4g5 (critical) — @zereight/mcp-gitlab: Unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover

medgithub_advisoriesPublished 2026-09-16

GHSA-cv3r-c5h8-f4g5 Severity: critical CVE: CVE-2026-61560

@zereight/mcp-gitlab: Unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover

### Summary

The SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server's local filesystem via an unsanitized `file_

MITRE ATT&CK techniques

CredentialsT1589.001

Indicators of compromise

CVE-2026-61560cve

Original source: https://github.com/advisories/GHSA-cv3r-c5h8-f4g5