{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:reason-jose_project:reason-jose:*:*:*:*:*:*:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.8.2"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2b4551287bf699af214cba265af762d711083fad"
            },
            {
              "fixed": "36cd724db3cbec121757624da49072386bd869e5"
            }
          ],
          "repo": "https://github.com/ulrikstrid/ocaml-jose",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-7jj9-6qwv-wpm7"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/23xxx/CVE-2023-23928.json"
  },
  "details": "reason-jose is a JOSE implementation in ReasonML and OCaml.`Jose.Jws.validate` does not check HS256 signatures. This allows tampering of JWS header and payload data if the service does not perform additional checks. Such tampering could expose applications using reason-jose to authorization bypass. Applications relying on JWS claims assertion to enforce security boundaries may be vulnerable to privilege escalation. This issue has been patched in version 0.8.2.",
  "id": "CVE-2023-23928",
  "modified": "2026-07-08T05:39:32.215755215Z",
  "published": "2023-02-01T00:59:38.475Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/ulrikstrid/reason-jose/releases/tag/v0.8.2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/23xxx/CVE-2023-23928.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/ulrikstrid/reason-jose/security/advisories/GHSA-7jj9-6qwv-wpm7"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-23928"
    },
    {
      "type": "FIX",
      "url": "https://github.com/ulrikstrid/reason-jose/commit/36cd724db3cbec121757624da49072386bd869e5"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "reason-jose ignores signature checks"
}