{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "source": "REFERENCES"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "abf53d6508755d3d22a994e28e370a9193ea977a"
            }
          ],
          "repo": "https://github.com/omnivore-app/omnivore",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-347"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82454.json",
    "unresolved_ranges": [
      {
        "extracted_events": [
          {
            "fixed": "abf53d650875"
          }
        ],
        "source": "AFFECTED_FIELD"
      }
    ]
  },
  "details": "The Omnivore API (packages/api) before the fix in commit abf53d6 contains an authentication bypass in Apple sign-in token verification. The decodeAppleToken function extracted the 'alg' field from the attacker-supplied JWT header and passed it as the sole allowed algorithm to jwt.verify(). Using jsonwebtoken v8 (which does not validate key/algorithm compatibility), an attacker can set alg=HS256 and sign a forged token using Apple's publicly available RSA public key as the HMAC secret, bypassing signature verification and impersonating any Apple-linked account.",
  "id": "CVE-2026-82454",
  "modified": "2026-09-02T03:31:02.087289663Z",
  "published": "2026-08-29T13:47:56.108Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82454.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82454"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-bypass-via-apple-sign-in"
    },
    {
      "type": "FIX",
      "url": "https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/omnivore-app/omnivore/pull/4652"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/omnivore-app/omnivore"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in"
}