{"id":"CVE-2026-44895","summary":"GitLab MCP Server: SSE transport has no authentication and wildcard CORS, exposing all GitLab tools","details":"GitLab MCP Server lets an AI agent talk directly to GitLab. Prior to 0.6.0, the HTTP transport in src/transport.ts ships with no authentication layer at all and a wildcard Access-Control-Allow-Origin: * on every response. The structural defect is that the SSE server stands up a stateful, mutation-capable RPC endpoint that is backed by the operator's GITLAB_PERSONAL_ACCESS_TOKEN without any inbound credential check, then advertises itself to every cross-origin browser context via the wildcard CORS header. The httpServer.listen(port) call at line 97 also passes no host argument, so the bind defaults to 0.0.0.0 and exposes the auth-less surface on every interface. This vulnerability is fixed in 0.6.0.","aliases":["GHSA-8jr5-6gvj-rfpf"],"modified":"2026-08-12T03:51:37.401532726Z","published":"2026-05-26T21:08:13.107Z","database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-306","CWE-942"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44895.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44895.json"},{"type":"ADVISORY","url":"https://github.com/yoda-digital/mcp-gitlab-server/security/advisories/GHSA-8jr5-6gvj-rfpf"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44895"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/yoda-digital/mcp-gitlab-server","events":[{"introduced":"0"},{"fixed":"9f6a41919a12725cd5d49bafe80c8bbd7ad2fe91"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"fixed":"0.6.0"}]}}],"versions":["v0.5.1","v0.5.0","v0.4.0","v0.3.2","v0.3.1"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44895.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N"}]}