{"id":"CVE-2026-76239","title":"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","summary":"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…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","cwe":["CWE-918"],"vendor":"stigmem-node","product":"stigmem-node","affected":["stigmem-node < 0.9.0a11"],"patched":["stigmem-node 0.9.0a11"],"published":"2026-08-19","updated":"2026-09-24","sourceUpdated":"2026-09-24T20:06:30.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-76239","references":[{"url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/stigmem-before-0a11-ssrf-via-unvalidated-webhook-delivery-address","label":"disclosure@vulncheck.com"},{"url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-5p3m-vhh6-9236","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://github.com/eidetic-labs/stigmem/pull/726"},{"url":"https://github.com/eidetic-labs/stigmem/commit/11637401d50629fef040382aee5af4571842c152"},{"url":"https://github.com/eidetic-labs/stigmem/commit/2ff5be29291d1c042e00d57c5f9ef93650cc90e0"},{"url":"https://github.com/eidetic-labs/stigmem"},{"url":"https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a11"}],"tags":["nvd","osv","pip"],"epss":0.00324,"epssPercentile":0.25298,"aliases":["GHSA-5p3m-vhh6-9236"],"ecosystem":"pip","ingestedAt":"2026-08-20T19:23:05.131Z","slug":"CVE-2026-76239","body":"## Overview\n\nStigmem 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-76239)\n\nAffected packages:\n\n- `stigmem-node < 0.9.0a11`\n\nPatched in:\n\n- `stigmem-node 0.9.0a11`\n\nSource: https://osv.dev/vulnerability/GHSA-5p3m-vhh6-9236","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}