https://cve.radiocsirt.org/rss/recent/all/10 Most recent entries from all 2026-10-12T08:38:26.596258+00:00 Vulnerability-Lookup csirt@opendfir.org python-feedgen Contains only the most 10 recent entries. https://cve.radiocsirt.org/vuln/cve-2020-15240 CVE-2020-15240 — Regression in JWT Signature Validation 2026-10-12T08:38:26.597751+00:00

Affected: auth0 omniauth-auth0

omniauth-auth0 (rubygems) versions >= 2.3.0 and < 2.4.1 improperly validate the JWT token signature when using the `jwt_validator.verify` method. Improper validation of the JWT token signature can allow an attacker to bypass authentication and authorization. You are affected by this vulnerability if all of the following conditions apply: 1. You are using `omniauth-auth0`. 2. You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK’s default Authorization Code Flow. The issue is patched in version 2.4.1.

 https://cve.radiocsirt.org/vuln/ghsa-58r4-h6v8-jcvm GHSA-58r4-h6v8-jcvm — Regression in JWT Signature Validation 2026-10-12T08:38:26.597801+00:00

Affected: RubyGems: omniauth-auth0

### Overview Versions after and including `2.3.0` are improperly validating the JWT token signature when using the `JWTValidator.verify` method. Improper validation of the JWT token signature when not using the default Authorization Code Flow can allow an attacker to bypass authentication and authorization.

### Am I affected? You are affected by this vulnerability if all of the following conditions apply:

- You are using `omniauth-auth0`. - You are using `JWTValidator.verify` method directly OR you are not authenticating using the SDK’s default Authorization Code Flow.

### How to fix that? Upgrade to version `2.4.1`.

### Will this update impact my users? The fix provided in this version will not affect your users.