FKIE_CVE-2026-32245

Vulnerability from fkie_nvd - Published: 2026-03-12 19:16 - Updated: 2026-03-19 20:46
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N
6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N
Summary
Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client's authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3.
References
security-advisories@github.comhttps://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89Patch
security-advisories@github.comhttps://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3Release Notes
security-advisories@github.comhttps://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcmExploit, Third Party Advisory
Impacted products
Vendor Product Version
tinyauth tinyauth *
To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:tinyauth:tinyauth:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "937C7D56-16AC-4536-B16E-D9057C5971DE",
              "versionEndIncluding": "5.0.2",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Tinyauth is an authentication and authorization server. Prior to 5.0.3, the OIDC token endpoint does not verify that the client exchanging an authorization code is the same client the code was issued to. A malicious OIDC client operator can exchange another client\u0027s authorization code using their own client credentials, obtaining tokens for users who never authorized their application. This violates RFC 6749 Section 4.1.3. This vulnerability is fixed in 5.0.3."
    },
    {
      "lang": "es",
      "value": "Tinyauth es un servidor de autenticaci\u00f3n y autorizaci\u00f3n. Anterior a la 5.0.3, el endpoint de token OIDC no verifica que el cliente que intercambia un c\u00f3digo de autorizaci\u00f3n sea el mismo cliente al que se le emiti\u00f3 el c\u00f3digo. Un operador de cliente OIDC malicioso puede intercambiar el c\u00f3digo de autorizaci\u00f3n de otro cliente usando sus propias credenciales de cliente, obteniendo tokens para usuarios que nunca autorizaron su aplicaci\u00f3n. Esto viola la Secci\u00f3n 4.1.3 del RFC 6749. Esta vulnerabilidad se corrige en la 5.0.3."
    }
  ],
  "id": "CVE-2026-32245",
  "lastModified": "2026-03-19T20:46:39.793",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "CHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 1.3,
        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "LOW",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-03-12T19:16:19.413",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/steveiliop56/tinyauth/commit/b2a1bfb1f532e87f205fa3afa3fc9f148c53ab89"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://github.com/steveiliop56/tinyauth/releases/tag/v5.0.3"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/steveiliop56/tinyauth/security/advisories/GHSA-xg2q-62g2-cvcm"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}


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