Vulnerability in Omnivore-App Omnivore
CVE-2026-82454
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (30.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.004 · change: +0.002
Affected products
Weakness classification (CWE)
References
- github.com/omnivore-app/omnivore/pull/4652 (issue-tracking, patch)
- github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a (patch)
- github.com/omnivore-app/omnivore (product)
- www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-byp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-82454?
- CVE-2026-82454 is a critical-severity vulnerability in Omnivore-App Omnivore, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-08-29.
- How severe is CVE-2026-82454?
- Critical severity. CVSS v3 base score is 9.1 out of 10.