Critical

Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in

Type: advisorySources: OSV

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.

Products: Not specified
Affected versions: Not specified
Fixed versions: Not specified
CVEs: CVE-2026-82454
Confirmed fixed CVEs: Not specified
Updated in this feed: 4 Nov 2026, 14:01 UTC · Revision 1

Source evidence

Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in

core-osv · Original source

Published 29 Aug 2026, 13:47 UTC

osv:CVE-2026-82454

Complete source record

{
  "id": "cb482a7d88c225e91eaed77184e671193a14936771e8ba46b02ea003b7349594",
  "url": "https://osv.dev/vulnerability/CVE-2026-82454",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in",
    "summary": "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.",
    "evidence": "osv:CVE-2026-82454",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-82454",
      "aliases": [
        "CVE-2026-82454"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "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"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/omnivore-app/omnivore",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "abf53d650875"
                },
                {
                  "fixed": "abf53d6508755d3d22a994e28e370a9193ea977a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "abf53d650875"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "fixed": "abf53d6508755d3d22a994e28e370a9193ea977a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "android-0.220.0",
            "android-0.218.0",
            "android-0.202.4",
            "android-0.202.3",
            "android-0.202.0",
            "android-0.200.8",
            "android-0.200.5",
            "android-0.200.4",
            "android-0.200.2",
            "android-0.200.1",
            "android-0.194.1",
            "android-0.194.0",
            "android-0.192.0",
            "android-0.190.0",
            "android-0.0.170",
            "android-0.0.178",
            "android-0.0.158",
            "android-0.0.152",
            "extension-2.8.9",
            "android-0.0.146",
            "android-0.0.134",
            "android-0.0.132",
            "android-0.0.130",
            "android-0.0.126",
            "android-0.0.124",
            "android-0.0.122",
            "android-0.0.118",
            "android-0.0.110",
            "android-0.0.102",
            "android-0.0.101",
            "v1.4.2-10"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-82454.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.122620346Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82454.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-82454",
        "https://www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-bypass-via-apple-sign-in",
        "https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a",
        "https://github.com/omnivore-app/omnivore/pull/4652",
        "https://github.com/omnivore-app/omnivore"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-347"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/82xxx/CVE-2026-82454.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-82454",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 503399,
  "published_at": "2026-08-29T13:47:56.108+00:00"
}