{"id":"CVE-2026-61560","summary":"@zereight/mcp-gitlab's unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover","details":"`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, 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_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server's `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch.","aliases":["GHSA-cv3r-c5h8-f4g5"],"modified":"2026-09-17T03:47:19.269325750Z","published":"2026-09-15T21:09:00.405Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61560.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-22"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61560.json"},{"type":"ADVISORY","url":"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61560"},{"type":"FIX","url":"https://github.com/zereight/gitlab-mcp/pull/482"},{"type":"FIX","url":"https://github.com/zereight/gitlab-mcp/pull/554"},{"type":"FIX","url":"https://github.com/zereight/gitlab-mcp/pull/622"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/zereight/gitlab-mcp","events":[{"introduced":"0"},{"fixed":"b5b4c3370f8ef366d3e7a1ba43aebedc014f0b08"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.1.27"}],"source":"AFFECTED_FIELD"}}],"versions":["v2.1.26","v2.1.25","v2.1.24","v2.1.23","v2.1.22","v2.1.21","v2.1.20","v2.1.19","v2.1.18","v2.1.17","v2.1.16","v2.1.15","v2.1.14","v2.1.13","v2.1.12","v2.1.11","v2.1.10","v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.36","v2.0.35","v2.0.34","v2.0.33","v2.0.32","v2.0.30","v2.0.28","v2.0.25","v2.0.24","v2.0.23","v2.0.22","v2.0.21","v2.0.20","v2.0.19","v2.0.18","v2.0.17","v2.0.16","v2.0.15","v2.0.14","v2.0.13","v2.0.12","v2.0.11","v2.0.9","v2.0.10","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v1.0.76","v1.0.73","v1.0.72","v","v1.0.65","v1.0.64","1.0.63","v1.0.63","1.0.62","1.0.60","v1.0.59","v1.0.57","v1.0.56","v1.0.54","v1.0.53","v1.0.52","v1.0.50","v1.0.48","v1.0.47","v1.0.46","v1.0.45","v1.0.42","v1.0.40","v1.0.39","v1.0.38","v1.0.37","v1.0.36","v1.0.34","1.0.32"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61560.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}