{"id":"CVE-2026-82454","summary":"Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in","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.","modified":"2026-09-02T03:31:02.087289663Z","published":"2026-08-29T13:47:56.108Z","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"}]},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/omnivore-app/omnivore","events":[{"introduced":"0"},{"fixed":"abf53d6508755d3d22a994e28e370a9193ea977a"}],"database_specific":{"source":"REFERENCES"}}],"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"}}],"schema_version":"1.9.0","severity":[{"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"}]}