{"id":"CVE-2026-33010","aliases":["GHSA-g9rg-8vq5-mpwm","PYSEC-2026-2625"],"url":"https://o3.security/vulnerability/CVE-2026-33010","summary":"mcp-memory-service's Wildcard CORS with Credentials Enables Cross-Origin Memory Theft","details":"mcp-memory-service is an open-source memory backend for multi-agent systems. Prior to version 10.25.1, when the HTTP server is enabled (MCP_HTTP_ENABLED=true), the application configures FastAPI's CORSMiddleware with allow_origins=['*'], allow_credentials=True, allow_methods=[\"*\"], and allow_headers=[\"*\"]. The wildcard Access-Control-Allow-Origin: * header permits any website to read API responses cross-origin. When combined with anonymous access (MCP_ALLOW_ANONYMOUS_ACCESS=true) - the simplest way to get the HTTP dashboard working without OAuth - no credentials are needed, so any malicious website can silently read, modify, and delete all stored memories. This issue has been patched in version 10.25.1.","published":"2026-03-20T18:33:39.007Z","modified":"2026-08-28T11:47:27.094596393Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},"epss":{"score":0.00387,"percentile":0.32527,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"mcp-memory-service","fixedVersion":"10.25.1"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33010.json"},{"type":"ADVISORY","url":"https://github.com/doobidoo/mcp-memory-service/security/advisories/GHSA-g9rg-8vq5-mpwm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-33010"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-28T11:47:27.094596393Z"}}