webhookd: Unrestricted HTTP Header to Shell Variable Injection

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-59157
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-15 16:17:16 UTC
Updated2026-09-30 17:51:56 UTC
Descriptionwebhookd 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS: 0.005960000 probability, percentile 0.482710000 (date 2026-10-27)

Problem Types: CWE-290 | CWE-807 | CWE-290 CWE-290: Authentication Bypass by Spoofing | CWE-807 CWE-807: Reliance on Untrusted Inputs in a Security Decision

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ncarlier Webhookd affected < 1.22 Not specified

References

ReferenceSourceLinkTags
github.com/ncarlier/webhookd/security/advisories/GHSA-v25g-mvwr-f5fp [email protected] github.com
github.com/ncarlier/webhookd/releases/tag/v1.22.0 [email protected] github.com
github.com/ncarlier/webhookd/pull/121 [email protected] github.com
github.com/ncarlier/webhookd/commit/5ac66677bf7224191f1dfc51a875b09187d1... [email protected] github.com
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