CVE-2026-54168

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.5 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Tekton Pipelines-as-Code: Unscoped GitHub App installation token allows unauthorized access to private repositories via remote task resolution

Impact

When Pipelines-as-Code is configured with a GitHub App installed across multiple repositories, the installation token issued during webhook processing is not scoped to the triggering repository by default. The token retains access to all repositories in the GitHub App installation.

This allows a user with push access to any repository in the installation to craft a PipelineRun with a remote task annotation pointing at a private repository in the same installation: 

pipelinesascode.tekton.dev/task: "https://github.com/org/private-repo/blob/main/.tekton/secret-task.yaml"
Pipelines-as-Code resolves and inlines the remote task using the unscoped token, exposing the contents of the private repository's Tekton definitions. This is a read-only confidentiality breach, no write access is exposed.

Patches

The fix extracts the repository ID from the webhook payload during initial parsing so that it is available for later use. It then adds a fallback in the client setup path so that when no explicit scoping configuration is present and ScopeTokenToListOfRepos returns empty, the token is re-issued scoped to the triggering repository's ID rather than retaining access to the entire installation. The initial token remains unscoped so that the extra-repos lookup can still discover and resolve additional repositories when configured.

The fix is available in v0.48.0. Supported backport releases will be added here after release tags are published.

Workarounds

Limit the GitHub App installation to only the repositories that require Pipelines-as-Code. Avoid org-wide installations or mixed-trust installations where repositories with different access requirements share the same GitHub App. This restricts the blast radius of the unscoped token to only the repositories that are explicitly selected during App installation.

Credits

Reported and fixed by the Pipelines-as-Code maintainers.

CVSS v3
6.5
EG Score
6.5(low)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

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
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

August 20, 2026

Last Modified

August 20, 2026

Vendor Advisories for CVE-2026-54168(1)

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

Data Freshness Timeline

(refreshed 1× in last 7d / 1× 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. 2026-08-20 18:42 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-54168?
CVE-2026-54168 is a medium vulnerability published on August 20, 2026. Tekton Pipelines-as-Code: Unscoped GitHub App installation token allows unauthorized access to private repositories via remote task resolution Impact When Pipelines-as-Code is configured with a GitHub App installed across multiple repositories, the installation token issued during webhook…
When was CVE-2026-54168 disclosed?
CVE-2026-54168 was first published in the National Vulnerability Database on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-54168?
CVE-2026-54168 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-54168?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-54168, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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