{"action":"Upgrade fastmcp to 3.2.0 or later.","affected":[{"fixed":"3.2.0","introduced":"0"}],"component":"fastmcp","cve_ids":["CVE-2026-27124"],"ecosystem":"PyPI","epss":0.00207,"exploited":false,"fixed_versions":["3.2.0"],"ghsa_id":"GHSA-rww4-4w9c-7733","id":"tcs_01M5KFYTW2B0DSPG9KA0NQQ535","modified_at":"2026-09-10T03:50:40.968939735Z","published_at":"2026-03-31T22:32:28Z","references":["https://osv.dev/vulnerability/GHSA-rww4-4w9c-7733","https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-rww4-4w9c-7733","https://github.com/jlowin/fastmcp/security/advisories/GHSA-rww4-4w9c-7733","https://nvd.nist.gov/vuln/detail/CVE-2026-27124","https://github.com/PrefectHQ/fastmcp"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"GHSA-rww4-4w9c-7733","url":"https://osv.dev/vulnerability/GHSA-rww4-4w9c-7733"},{"source":"nvd","source_id":"CVE-2026-27124","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-27124"}],"summary":"FastMCP: Missing Consent Verification in OAuth Proxy Callback Facilitates Confused Deputy Vulnerabilities"}