FKIE_CVE-2026-45793

Vulnerability from fkie_nvd - Published: 2026-07-15 17:16 - Updated: 2026-07-15 20:54
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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_<id>_<base64url-JWT> 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.
References
security-advisories@github.comhttps://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039
security-advisories@github.comhttps://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1
security-advisories@github.comhttps://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714
security-advisories@github.comhttps://github.com/composer/composer/pull/12853
security-advisories@github.comhttps://github.com/composer/composer/pull/12855
security-advisories@github.comhttps://github.com/composer/composer/releases/tag/1.10.28
security-advisories@github.comhttps://github.com/composer/composer/releases/tag/2.2.28
security-advisories@github.comhttps://github.com/composer/composer/releases/tag/2.9.8
security-advisories@github.comhttps://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "composer",
          "vendor": "composer",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 1.0, \u003c 1.10.28"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.0.0, \u003c 2.2.28"
            },
            {
              "status": "affected",
              "version": "\u003e= 2.3.0, \u003c 2.9.8"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-45793",
  "lastModified": "2026-07-15T20:54:43.733",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-45793",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-15T18:11:02.102503Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-15T17:16:48.173",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/commit/3f5e7f9fbfa541137d6d1d5643ec3b718e9d5039"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/commit/65e6390c49f1a11cd8b660d81822086db51fe2d1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/commit/e66c8fdb7ff5409bd2f358c5f194038e49e93714"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/pull/12853"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/pull/12855"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/releases/tag/1.10.28"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/releases/tag/2.2.28"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/releases/tag/2.9.8"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/composer/composer/security/advisories/GHSA-f9f8-rm49-7jv2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-200"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}



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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.