Remote Code Execution Vulnerability in Webhookd by nCarlier
CVE-2026-59157

6.5MEDIUM

Key Information:

Vendor

Ncarlier

Status
Webhookd
Vendor
CVE Published:
15 September 2026

What is CVE-2026-59157?

Webhookd, a minimalist webhook server developed by nCarlier, contained a security flaw prior to version 1.22.0 that allowed unauthenticated remote attackers to exploit the HTTP header forwarding mechanism. Specifically, the absence of htpasswd authentication meant that all incoming HTTP headers were passed into hook scripts without a proper allowlist. This enabled attackers to spoof the X-WebAuthn-User header, potentially granting them unauthorized access to resources within the application. It is crucial for users of webhookd to upgrade to version 1.22.0 to mitigate this risk.

Affected Version(s)

webhookd < 1.22

References

https://github.com/ncarlier/webhookd/security/advisories/...
x_refsource_CONFIRM
https://github.com/ncarlier/webhookd/pull/121
x_refsource_MISC
https://github.com/ncarlier/webhookd/commit/5ac66677bf722...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.