{"id":"CVE-2026-82454","state":"PUBLISHED","title":"Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in","description":"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.","publishedAt":"2026-08-29T13:47:56.108Z","updatedAt":"2026-09-24T14:20:29.912Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"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","source":"VulnCheck"},"assigner":"VulnCheck","products":["omnivore-app omnivore"],"affected":[{"vendor":"omnivore-app","product":"omnivore","packageURL":"pkg:github/omnivore-app/omnivore","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"abf53d650875","versionType":"git"}]}],"references":["https://github.com/omnivore-app/omnivore/pull/4652","https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a","https://github.com/omnivore-app/omnivore","https://www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-bypass-via-apple-sign-in"],"weaknesses":["CWE-347"],"ingestedAt":"2026-10-29T20:13:15.269Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/82xxx/CVE-2026-82454.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-82454","state":"PUBLISHED","datePublished":"2026-08-29T13:47:56.108Z","dateUpdated":"2026-09-24T14:20:29.912Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-08-29T13:22:59.269Z"},"containers":{"cna":{"title":"Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"omnivore-app","product":"omnivore","packageURL":"pkg:github/omnivore-app/omnivore","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"abf53d650875","versionType":"git"}]}],"references":[{"url":"https://github.com/omnivore-app/omnivore/pull/4652","tags":["issue-tracking","patch"],"name":"Pull Request #4652"},{"url":"https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a","tags":["patch"],"name":"Patch Commit"},{"url":"https://github.com/omnivore-app/omnivore","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-bypass-via-apple-sign-in","name":"VulnCheck Advisory: Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"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","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":9.3,"baseSeverity":"CRITICAL"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"NONE","baseScore":9.1,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-347","lang":"en","description":"Improper Verification of Cryptographic Signature","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-09-24T14:20:29.912Z"},"datePublic":"2026-08-25T00:00:00.000Z","credits":[{"lang":"en","value":"Yu Sun","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-31T16:34:03.423024Z","id":"CVE-2026-82454","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-31T18:53:04.095Z"}}]}}}