---
id: CVE-2026-82454
title: >-
  The Omnivore API (packages/api) before the fix in commit abf53d6 contains an
  authentication bypass in Apple sign-in token verification
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 pas…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-347
vendor: omnivore-app
product: omnivore
affected:
  - omnivore < abf53d650875
published: '2026-08-29'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:08:55.030'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-82454'
references:
  - url: 'https://github.com/omnivore-app/omnivore'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/omnivore-app/omnivore/commit/abf53d6508755d3d22a994e28e370a9193ea977a
    label: disclosure@vulncheck.com
  - url: 'https://github.com/omnivore-app/omnivore/pull/4652'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/omnivore-before-android-0.227.0-authentication-bypass-via-apple-sign-in
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
epss: 0.00386
epssPercentile: 0.29922
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-08-31T16:34:03.423024Z'
ingestedAt: '2026-08-30T07:49:08.636Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.