{"id":"CVE-2026-59157","title":"webhookd is a minimalist webhook server that triggers shell scripts and external processes through HTTP requests","summary":"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 HTTPParam…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-290","CWE-807"],"vendor":"ncarlier","product":"webhookd","affected":["webhookd < 1.22"],"patched":["github.com/ncarlier/webhookd 1.22.0"],"published":"2026-09-15","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:17:13.713","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-59157","references":[{"url":"https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb","label":"security-advisories@github.com"},{"url":"https://github.com/ncarlier/webhookd/pull/121","label":"security-advisories@github.com"},{"url":"https://github.com/ncarlier/webhookd/releases/tag/v1.22.0","label":"security-advisories@github.com"},{"url":"https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp","label":"security-advisories@github.com"},{"url":"https://github.com/ncarlier/webhookd"},{"url":"https://github.com/advisories/GHSA-v25g-mvwr-f5fp"}],"tags":["nvd","cve.org","osv","go","ghsa"],"aliases":["GHSA-v25g-mvwr-f5fp","GO-2026-6451"],"ecosystem":"go","ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-16T15:38:31.622911Z"},"ingestedAt":"2026-09-10T00:26:24.579Z","epss":0.00461,"epssPercentile":0.391,"slug":"CVE-2026-59157","body":"## Overview\n\nwebhookd 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-59157)\n\nAffected packages:\n\n- `github.com/ncarlier/webhookd < 1.22.0`\n\nPatched in:\n\n- `github.com/ncarlier/webhookd 1.22.0`\n\nSource: https://osv.dev/vulnerability/GHSA-v25g-mvwr-f5fp","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}