CVE-2026-54167

HIGHPre-NVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (17th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
52
EG Risk 52/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation0% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
17th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 20, 2026

Last Modified

September 30, 2026

Advisory Details (9)

Auto-updated Sep 15, 2026
Patch available. Sources: github_commit, github_release, github.
github_release Patch Available

v0.48.0

Patch available: tektoncd/pipelines-as-code v0.48.0

https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.48.0
github_release Patch Available

v0.42.1

Patch available: tektoncd/pipelines-as-code v0.42.1

https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.42.1
github_release Patch Available

v0.39.6

Patch available: tektoncd/pipelines-as-code v0.39.6

https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.39.6
github_release Patch Available

v0.37.8

Patch available: tektoncd/pipelines-as-code v0.37.8

https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.37.8
github_commit

commit e0c4a11ea380 (tektoncd/pipelines-as-code)

Fix landed in tektoncd/pipelines-as-code commit e0c4a11ea380 — awaiting tagged release

https://github.com/tektoncd/pipelines-as-code/commit/e0c4a11ea3800ab9d26cf3a8ae92b74cf18527c3
github_commit

commit ac6fded6dfb6 (tektoncd/pipelines-as-code)

Fix landed in tektoncd/pipelines-as-code commit ac6fded6dfb6 — awaiting tagged release

https://github.com/tektoncd/pipelines-as-code/commit/ac6fded6dfb69ade7197d4eeed6e90ddbe1b79bc
github_commit

commit 40813976a779 (tektoncd/pipelines-as-code)

Fix landed in tektoncd/pipelines-as-code commit 40813976a779 — awaiting tagged release

https://github.com/tektoncd/pipelines-as-code/commit/40813976a77920feaf52671320d6d3c5ff08eb7e
github_commit

commit 402d5c7eeece (tektoncd/pipelines-as-code)

Fix landed in tektoncd/pipelines-as-code commit 402d5c7eeece — awaiting tagged release

https://github.com/tektoncd/pipelines-as-code/commit/402d5c7eeece881cb082ec68e9e8b61709e39ace
github Patch Available

Pipelines-as-Code GitHub App token request can be redirected via untrusted Enterprise Host header · Advisory · tektoncd/pipelines-as-code · GitHub

https://github.com/tektoncd/pipelines-as-code/security/advisories/GHSA-f5f4-3hh4-f54m

Vendor Advisories for CVE-2026-54167(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFix by version rangeDependents
github.com/openshift-pipelines/pipelines-as-code—
  • 0.43.0 up to 0.48.0: fixed in 0.48.0
  • 0.40.0 up to 0.42.1: fixed in 0.42.1
  • 0.38.0 up to 0.39.6: fixed in 0.39.6
  • every version up to 0.37.8: fixed in 0.37.8
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-10-05 05:00 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-03 16:46 UTCEG score recompute
  4. 2026-10-03 14:26 UTCEPSS rescore
  5. 2026-10-02 21:00 UTCEG score recompute
  6. 2026-10-02 17:56 UTCEPSS rescore
  7. 2026-10-01 21:28 UTCEG score recompute
  8. 2026-10-01 19:50 UTCEPSS rescore
  9. 2026-09-30 17:51 UTCEG score recompute
  10. 2026-09-30 15:03 UTCEPSS rescore
  11. 2026-09-30 08:12 UTCEG score recompute
  12. 2026-09-29 15:22 UTCEPSS rescore
  13. 2026-09-29 01:54 UTCEG score recompute
  14. 2026-09-28 14:37 UTCEG score recompute
  15. 2026-09-28 13:51 UTCEPSS rescore
  16. 2026-09-27 15:55 UTCEG score recompute
  17. 2026-09-27 13:48 UTCEPSS rescore
  18. 2026-09-27 02:58 UTCEG score recompute
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-24 16:55 UTCEG score recompute
  21. 2026-09-24 14:04 UTCEPSS rescore
  22. 2026-09-22 19:45 UTCEG score recompute
  23. 2026-09-22 06:23 UTCEG score recompute
  24. 2026-09-21 07:49 UTCEG score recompute
  25. 2026-09-20 20:16 UTCEPSS rescore
Show 10 more
  1. 2026-09-19 21:29 UTCEG score recompute
  2. 2026-09-18 22:57 UTCEG score recompute
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 00:26 UTCEG score recompute
  5. 2026-09-17 19:31 UTCEPSS rescore
  6. 2026-09-16 14:22 UTCEG score recompute
  7. 2026-09-16 14:08 UTCEPSS rescore
  8. 2026-09-15 15:34 UTCEG score recompute
  9. 2026-09-15 15:02 UTCEG score recompute
  10. 2026-08-20 18:42 UTCEG score recompute

Related CVEs(same product + same CWE)

Same product

1 shown

Go:github.com/openshift-pipelines/pipelines-as-code

Frequently asked(5)

What is CVE-2026-54167?
CVE-2026-54167 is a high vulnerability published on August 20, 2026. 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…
When was CVE-2026-54167 disclosed?
CVE-2026-54167 was first published on August 20, 2026, with the most recent update on September 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-54167 actively exploited?
CVE-2026-54167 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (17th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-54167?
CVE-2026-54167 has a CVSS base score of 8.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-54167?
A fix for CVE-2026-54167 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-54167 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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