Vulnerability · Published Aug 29, 2026 · Assigned by VulnCheck

CVE-2026-82454Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in

Critical 9.1

In plain English

A critical-severity security flaw in omnivore from omnivore-app. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)0.4%top 67.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
omnivore-app	omnivore	0 – before abf53d650875

Weakness: CWE-347 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Pull Request #4652 issue-tracking, patch
Patch Commit patch
https://github.com/omnivore-app/omnivore product
VulnCheck Advisory: Omnivore before android-0.227.0 Authentication Bypass via Apple Sign-in third-party-advisory