{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59157","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-02T16:50:27.887Z","datePublished":"2026-09-15T15:46:35.418Z","dateUpdated":"2026-09-16T15:38:42.407Z"},"containers":{"cna":{"title":"webhookd: Unrestricted HTTP Header to Shell Variable Injection","problemTypes":[{"descriptions":[{"cweId":"CWE-290","lang":"en","description":"CWE-290: Authentication Bypass by Spoofing","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-807","lang":"en","description":"CWE-807: Reliance on Untrusted Inputs in a Security Decision","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp"},{"name":"https://github.com/ncarlier/webhookd/pull/121","tags":["x_refsource_MISC"],"url":"https://github.com/ncarlier/webhookd/pull/121"},{"name":"https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb","tags":["x_refsource_MISC"],"url":"https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb"},{"name":"https://github.com/ncarlier/webhookd/releases/tag/v1.22.0","tags":["x_refsource_MISC"],"url":"https://github.com/ncarlier/webhookd/releases/tag/v1.22.0"}],"affected":[{"vendor":"ncarlier","product":"webhookd","versions":[{"version":"< 1.22","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-09-15T15:46:35.418Z"},"descriptions":[{"lang":"en","value":"webhookd is a minimalist webhook server that triggers shell scripts and external processes through HTTP requests. Prior to 1.22.0, webhookd deployments without htpasswd authentication forwarded all incoming HTTP headers through HTTPParamsToShellVars in pkg/api/index.go into the hook script environment without an allowlist. When an upstream reverse proxy did not strip a client-supplied X-WebAuthn-User header and a hook script trusted that variable for identity or privilege, a remote unauthenticated attacker could spoof another user, bypass script security controls, and access or modify resources available to the impersonated identity. This issue is fixed in version 1.22.0."}],"source":{"advisory":"GHSA-v25g-mvwr-f5fp","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-16T15:38:31.622911Z","id":"CVE-2026-59157","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-16T15:38:42.407Z"}}]}}