Vulnerability from bitnami_vulndb
Published
2026-07-20 20:36
Modified
2026-07-20 21:02
Summary
Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs
Details

Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\IO\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs__ format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "composer",
        "purl": "pkg:bitnami/composer"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.0.0"
            },
            {
              "fixed": "1.10.28"
            },
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.2.28"
            },
            {
              "introduced": "2.3.0"
            },
            {
              "fixed": "2.9.8"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "type": "CVSS_V3"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45793"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:getcomposer:composer:*:*:*:*:*:php:*:*"
    ],
    "severity": "High"
  },
  "details": "Composer is a dependency Manager for the PHP language. Prior to 1.10.28, 2.2.28, and 2.9.8, Composer\\IO\\BaseIO::loadConfiguration() validates GitHub OAuth tokens with the regex ^[.A-Za-z0-9_]+$ and interpolates rejected tokens into an UnexpectedValueException; GitHub Actions GITHUB_TOKEN values using the ghs_\u003cid\u003e_\u003cbase64url-JWT\u003e format can contain -, fail validation, and be disclosed to stderr or CI logs. This issue is fixed in versions 1.10.28, 2.2.28, and 2.9.8.",
  "id": "BIT-composer-2026-45793",
  "modified": "2026-07-20T21:02:01.540Z",
  "published": "2026-07-20T20:36:59.690Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/pull/12853"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/pull/12855"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/1.10.28"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.2.28"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/releases/tag/2.9.8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45793"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Composer: Github Actions issued GITHUB_TOKEN disclosure in GitHub Actions logs"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • 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.