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    <lastBuildDate>Wed, 07 Oct 2026 10:38:16 +0000</lastBuildDate>
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      <title>CVE-2026-59157 — webhookd: Unrestricted HTTP Header to Shell Variable Injection</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2026-59157</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ncarlier webhookd&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; ncarlier webhookd&lt;/p&gt;
&lt;p&gt;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.&lt;/p&gt;</content:encoded>
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