Vulnerability · Published Sep 15, 2026 · Assigned by GitHub_M
CVE-2026-54167Pipelines-as-Code GitHub App token request can be redirected via untrusted Enterprise Host header
High 8.2
In plain English
A high-severity insufficient verification of data authenticity in pipelines-as-code from tektoncd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 19% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/openshift-pipelines/pipelines-as-code | 0.48.0 | GHSA-f5f4-3hh4-f54m |
| Go | github.com/openshift-pipelines/pipelines-as-code | 0.42.1 | GHSA-f5f4-3hh4-f54m |
| Go | github.com/openshift-pipelines/pipelines-as-code | 0.39.6 | GHSA-f5f4-3hh4-f54m |
| Go | github.com/openshift-pipelines/pipelines-as-code | 0.37.8 | GHSA-f5f4-3hh4-f54m |
| Go | github.com/openshift-pipelines/pipelines-as-code | 0.37.8, 0.39.6, 0.42.1, 0.48.0 | GO-2026-6266 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| tektoncd | pipelines-as-code | < 0.37.8>= 0.38.0, < 0.39.6>= 0.40.0, < 0.42.1>= 0.43.0, < 0.48.0 |
Weakness: CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
References
- https://github.com/tektoncd/pipelines-as-code/security/advisories/GHSA-f5f4-3hh4-f54m x_refsource_CONFIRM
- https://github.com/tektoncd/pipelines-as-code/commit/402d5c7eeece881cb082ec68e9e8b61709e39ace x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/commit/40813976a77920feaf52671320d6d3c5ff08eb7e x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/commit/ac6fded6dfb69ade7197d4eeed6e90ddbe1b79bc x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/commit/e0c4a11ea3800ab9d26cf3a8ae92b74cf18527c3 x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.37.8 x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.39.6 x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.42.1 x_refsource_MISC
- https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.48.0 x_refsource_MISC