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CVE-2026-54167 is a vulnerability in the Pipelines-as-Code GitHub App provider in which the webhook handling logic improperly trusted the X-GitHub-Enterprise-Host header before validating the webhook signature. By supplying a crafted webhook request with an attacker-controlled Enterprise host value, an unauthenticated attacker able to reach the webhook endpoint could cause the controller to generate a locally signed GitHub App JWT and send it to an attacker-controlled host. The flaw stems from using untrusted request metadata to influence security-sensitive token generation and outbound communication prior to establishing the authenticity of the webhook payload. Successful exploitation can expose GitHub App credentials that can then be used to obtain installation access tokens within the JWT validity period, constrained by the affected installation's configured scope and permissions.
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