TektonCD Pipelines-as-Code up to 0.37.7/0.39.5/0.42.0/0.47.x GitHub App Provider improper authentication

Summaryinfo

A vulnerability labeled as critical has been found in TektonCD Pipelines-as-Code up to 0.37.7/0.39.5/0.42.0/0.47.x. The impacted element is an unknown function of the component GitHub App Provider. Such manipulation leads to improper authentication. This vulnerability is documented as CVE-2026-54167. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in TektonCD Pipelines-as-Code up to 0.37.7/0.39.5/0.42.0/0.47.x. Affected by this issue is an unknown part of the component GitHub App Provider. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. CVE summarizes:

Pipelines-as-Code is a CI/CD system that lets users define Tekton pipelines in source code repositories. Prior to 0.37.8, 0.39.6, 0.42.1, and 0.48.0, the GitHub App provider accepts X-GitHub-Enterprise-Host as the API host while processing webhook events containing an installation.id, before webhook signature validation or confirmation that the host matches the repository URL in the signed payload. An unauthenticated attacker who can reach the webhook endpoint can select an attacker-controlled host and cause the controller to send a locally signed GitHub App JWT to that service. The exposed JWT may be used to attempt to mint installation access tokens during its validity window, subject to the GitHub App installation and permissions. The incoming webhook installation-lookup path is also affected, but exploitation of that path requires the valid incoming webhook secret for the target Repository CR. This issue is fixed in versions 0.37.8, 0.39.6, 0.42.1, and 0.48.0.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-54167 since 06/11/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 0.37.8, 0.39.6, 0.42.1 or 0.48.0 eliminates this vulnerability.

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Productinfo

Vendor

• TektonCD

Name

• Pipelines-as-Code

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29
• 0.30
• 0.31
• 0.32
• 0.33
• 0.34
• 0.35
• 0.36
• 0.37
• 0.37.0
• 0.37.1
• 0.37.2
• 0.37.3
• 0.37.4
• 0.37.5
• 0.37.6
• 0.37.7
• 0.38
• 0.39
• 0.39.0
• 0.39.1
• 0.39.2
• 0.39.3
• 0.39.4
• 0.39.5
• 0.40
• 0.41
• 0.42
• 0.42.0
• 0.43
• 0.44
• 0.45
• 0.46
• 0.47

Website

• Product: https://github.com/tektoncd/pipelines-as-code/

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