OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows

{
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-105119",
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "dateUpdated": "2026-10-03T12:14:43.643Z",
    "dateReserved": "2026-10-03T12:04:36.964Z",
    "datePublished": "2026-10-03T12:14:43.643Z",
    "state": "PUBLISHED"
  },
  "containers": {
    "cna": {
      "providerMetadata": {
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck",
        "dateUpdated": "2026-10-03T12:14:43.643Z"
      },
      "datePublic": "2026-09-18T00:00:00.000Z",
      "title": "OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows",
      "descriptions": [
        {
          "lang": "en",
          "value": "OpenAM before 16.1.3 applies its OAuth2 Provider PKCE enforcement only to authorization requests whose response_type is exactly code, so codes issued through OpenID Connect hybrid flows (code token, code id_token, code token id_token) carry no bound challenge. An attacker who intercepts such a code can redeem it for a public client's tokens with any non-empty code_verifier."
        }
      ],
      "affected": [
        {
          "vendor": "OpenIdentityPlatform",
          "product": "OpenAM",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "16.1.3"
            },
            {
              "version": "16.1.3",
              "status": "unaffected",
              "versionType": "semver"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "Improper Authorization",
              "cweId": "CWE-285",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-5p2f-7vcr-6vfh",
          "name": "GitHub Security Advisory (GHSA-5p2f-7vcr-6vfh)",
          "tags": [
            "vendor-advisory"
          ]
        },
        {
          "url": "https://www.vulncheck.com/advisories/openam-before-16.1.3-pkce-enforcement-bypass-via-oauth-2.0-hybrid-flows",
          "name": "VulnCheck Advisory: OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 Hybrid Flows",
          "tags": [
            "third-party-advisory"
          ]
        }
      ],
      "metrics": [
        {
          "format": "CVSS"
        },
        {
          "format": "CVSS",
          "cvssV3_1": {
            "version": "3.1",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
            "attackVector": "NETWORK",
            "attackComplexity": "HIGH",
            "privilegesRequired": "NONE",
            "userInteraction": "REQUIRED",
            "scope": "UNCHANGED",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "arpitjain099",
          "type": "reporter"
        },
        {
          "lang": "en",
          "value": "maximthomas",
          "type": "finder"
        },
        {
          "lang": "en",
          "value": "tsujiguchitky",
          "type": "finder"
        }
      ]
    }
  }
}