# Pipelines-as-Code GitHub App token request can be redirected via untrusted Enterprise Host header Advisory record · `GHSA-f5f4-3hh4-f54m` - **Identifiers:** `GHSA-f5f4-3hh4-f54m` · `CVE-2026-54167` · `GO-2026-6266` - **State:** Confirmed - **Severity:** CVSS 8.2 High - **Critical:** No - **Weakness (CWE):** [CWE-345](https://cwe.mitre.org/data/definitions/345.html) - **Tags:** [CWE-345](https://agentprime.io/advisories/tag/cwe-345.md) - **Published:** 20 Aug 2026 - **Updated:** 28 Oct 2026 - **Reviewed by a person:** No Published by the GitHub Advisory Database at 20 Aug 2026, 18:36 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. ## Affected packages - `github.com/openshift-pipelines/pipelines-as-code` (Go): affected `>=0.43.0, <0.48.0 || >=0.40.0, <0.42.1 || >=0.38.0, <0.39.6 || <0.37.8`; fixed in `0.48.0`, `0.42.1`, `0.39.6`, `0.37.8` ## Machine-written summary Summary written by Claude Haiku from the source advisory. Not reviewed by a person. > Pipelines-as-Code versions before 0.37.8, from 0.38.0 before 0.39.6, from 0.40.0 before 0.42.1, and from 0.43.0 before 0.48.0 are affected. An attacker who can reach the webhook endpoint can send a crafted GitHub webhook with an attacker-chosen Enterprise Host header, which causes the controller to send a GitHub App JWT to that host and may let the attacker mint installation access tokens within the JWT's validity window. Upgrade to 0.37.8, 0.39.6, 0.42.1, 0.48.0, or later; until then, strip or block unexpected X-GitHub-Enterprise-Host headers at the proxy in front of the webhook endpoint. Written 1 Nov 2026. ## Not analysed yet We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check. ## Severity and exploitation - 8.2 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N`, from CNA (GitHub_M) - **CISA KEV:** Not listed. - **EPSS:** 0.0027, the 19th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days. ## Timeline - 31 Oct 2026, 14:11 UTC: First seen by agentprime - 31 Oct 2026, 14:11 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-f5f4-3hh4-f54m) ## Sources - [GitHub Advisory Database: GHSA-f5f4-3hh4-f54m](https://github.com/advisories/GHSA-f5f4-3hh4-f54m) - [OSV: GHSA-f5f4-3hh4-f54m](https://osv.dev/vulnerability/GHSA-f5f4-3hh4-f54m) - - - - - - - - - - - - Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code. ## Check whether this affects you A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet. - With the agentprime MCP server (), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: - In a browser: reads your lockfile in the browser, never uploading it. - Whether it touches your code, with file and line: the Claude Code plugin, - As JSON: , or `POST https://api.agentprime.io/v1/match` with your packages () --- The web page: . Everything for agents: .