Vulnerability-Lookup

GHSA-6F2P-296R-CC28

Vulnerability from github – Published: 2026-08-20 18:36 – Updated: 2026-08-20 18:36

Summary

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

Details

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.

Severity

6.5 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openshift-pipelines/pipelines-as-code"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.37.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openshift-pipelines/pipelines-as-code"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.38.0"
            },
            {
              "fixed": "0.39.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openshift-pipelines/pipelines-as-code"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.40.0"
            },
            {
              "fixed": "0.42.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/openshift-pipelines/pipelines-as-code"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.43.0"
            },
            {
              "fixed": "0.48.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-54168"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-269",
      "CWE-862"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-08-20T18:36:40Z",
    "nvd_published_at": null,
    "severity": "MODERATE"
  },
  "details": "### Impact\nWhen 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.\n\nThis 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:\n```\npipelinesascode.tekton.dev/task: \"https://github.com/org/private-repo/blob/main/.tekton/secret-task.yaml\"\n```\nPipelines-as-Code resolves and inlines the remote task using the unscoped token, exposing the contents of the private repository\u0027s Tekton definitions. This is a read-only confidentiality breach, no write access is exposed.\n\n### Patches\nThe 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\u0027s 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.\n\nThe fix is available in v0.48.0. Supported backport releases will be added here after release tags are published.\n\n### Workarounds\nLimit 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.\n\n### Credits\nReported and fixed by the Pipelines-as-Code maintainers.",
  "id": "GHSA-6f2p-296r-cc28",
  "modified": "2026-08-20T18:36:41Z",
  "published": "2026-08-20T18:36:40Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipelines-as-code/security/advisories/GHSA-6f2p-296r-cc28"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tektoncd/pipelines-as-code"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tekton Pipelines-as-Code: Unscoped GitHub App installation token allows unauthorized access to private repositories via remote task resolution"
}

CVE-2026-54168 (GCVE-0-2026-54168)

Vulnerability from cvelistv5 – Published: 2026-09-15 14:27 – Updated: 2026-09-17 14:30

Title

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

Summary

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, a GitHub App installation token created during webhook processing is not scoped to the repository that triggered the event when the App is installed across multiple repositories. A user with push access to one repository can submit a PipelineRun containing a pipelinesascode.tekton.dev/task remote task annotation that targets a private repository in the same installation. When ScopeTokenToListOfRepos returns no explicit scope, the missing triggering repository ID leaves the token able to access the entire installation. Pipelines-as-Code resolves and inlines the remote private task with that token, disclosing the repository's Tekton definitions. The demonstrated impact is read-only and does not provide write access. This issue is fixed in versions 0.37.8, 0.39.6, 0.42.1, and 0.48.0.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 14:30 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-862 - Missing Authorization

Assigner

GitHub_M mitre root

References

9 references

URL	Tags
https://github.com/tektoncd/pipelines-as-code/sec…	x_refsource_CONFIRM
https://github.com/tektoncd/pipelines-as-code/com…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/com…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/com…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/com…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/rel…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/rel…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/rel…	x_refsource_MISC
https://github.com/tektoncd/pipelines-as-code/rel…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
tektoncd	pipelines-as-code	Affected: < 0.37.8 Affected: >= 0.38.0, < 0.39.6 Affected: >= 0.40.0, < 0.42.1 Affected: >= 0.43.0, < 0.48.0

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                "id": "CVE-2026-54168",
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                    "Exploitation": "none"
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-17T14:30:42.954463Z",
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        "title": "CISA ADP Vulnrichment"
      }
    ],
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              "status": "affected",
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      ],
      "descriptions": [
        {
          "lang": "en",
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
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            "userInteraction": "NONE",
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          "descriptions": [
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            "x_refsource_MISC"
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          "url": "https://github.com/tektoncd/pipelines-as-code/commit/40813976a77920feaf52671320d6d3c5ff08eb7e"
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          "tags": [
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          "url": "https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.39.6"
        },
        {
          "name": "https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.42.1",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.42.1"
        },
        {
          "name": "https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.48.0",
          "tags": [
            "x_refsource_MISC"
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          "url": "https://github.com/tektoncd/pipelines-as-code/releases/tag/v0.48.0"
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        "discovery": "UNKNOWN"
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      "title": "Pipelines-as-Code: Unscoped GitHub App installation token allows unauthorized access to private repositories via remote task resolution"
    }
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    "datePublished": "2026-09-15T14:27:44.344Z",
    "dateReserved": "2026-06-11T21:46:52.381Z",
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    "state": "PUBLISHED"
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  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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