CVE-2026-59157

{"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"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-59157", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-16T15:38:31.622911Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-16T15:38:38.935Z"}}], "cna": {"title": "webhookd: Unrestricted HTTP Header to Shell Variable Injection", "source": {"advisory": "GHSA-v25g-mvwr-f5fp", "discovery": "UNKNOWN"}, "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}}], "affected": [{"vendor": "ncarlier", "product": "webhookd", "versions": [{"status": "affected", "version": "< 1.22"}]}], "references": [{"url": "https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp", "name": "https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp", "tags": ["x_refsource_CONFIRM"]}, {"url": "https://github.com/ncarlier/webhookd/pull/121", "name": "https://github.com/ncarlier/webhookd/pull/121", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb", "name": "https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb", "tags": ["x_refsource_MISC"]}, {"url": "https://github.com/ncarlier/webhookd/releases/tag/v1.22.0", "name": "https://github.com/ncarlier/webhookd/releases/tag/v1.22.0", "tags": ["x_refsource_MISC"]}], "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."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-290", "description": "CWE-290: Authentication Bypass by Spoofing"}]}, {"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-807", "description": "CWE-807: Reliance on Untrusted Inputs in a Security Decision"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-15T15:46:35.418Z"}}}, "cveMetadata": {"cveId": "CVE-2026-59157", "state": "PUBLISHED", "dateUpdated": "2026-09-16T15:38:42.407Z", "dateReserved": "2026-07-02T16:50:27.887Z", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "datePublished": "2026-09-15T15:46:35.418Z", "assignerShortName": "GitHub_M"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"product": "webhookd", "vendor": "ncarlier", "versions": [{"status": "affected", "version": "< 1.22"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-59157", "lastModified": "2026-09-30T17:51:56.193", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-59157", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-16T15:38:31.622911Z", "version": "2.0.3"}}]}, "published": "2026-09-15T16:17:16.957", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d10beb"}, {"source": "security-advisories@github.com", "url": "https://github.com/ncarlier/webhookd/pull/121"}, {"source": "security-advisories@github.com", "url": "https://github.com/ncarlier/webhookd/releases/tag/v1.22.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-290"}, {"lang": "en", "value": "CWE-807"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,1.22)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "webhookd", "source": "cna", "vendor": "ncarlier"}, "product": "webhookd", "vendor": "ncarlier"}], "created": "2026-09-16T02:45:04.505750+00:00", "updated": "2026-09-20T16:00:14.107979+00:00", "vendors": ["ncarlier", "ncarlier$PRODUCT$webhookd"]}