{"id":"CVE-2026-76239","aliases":["GHSA-5p3m-vhh6-9236"],"url":"https://o3.security/vulnerability/CVE-2026-76239","summary":"Stigmem before 0.9.0a11 SSRF via unvalidated webhook delivery_address","details":"Stigmem before 0.9.0a11 fails to validate the delivery_address parameter when creating webhook subscriptions, allowing authenticated users to specify internal loopback and private network destinations. Attackers can trigger matching fact-change events to cause the Stigmem server to issue server-side HTTP POST requests to internal services, enabling blind SSRF attacks against localhost and private network endpoints.","published":"2026-08-19T14:02:17.336Z","modified":"2026-08-21T03:47:08.987314380Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"PyPI","name":"stigmem-node","fixedVersion":"0.9.0a11"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76239.json"},{"type":"ADVISORY","url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76239"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-21T03:47:08.987314380Z"}}