High severity7.4NVD Advisory· Published Oct 21, 2020· Updated Jun 17, 2026
CVE-2020-15240
CVE-2020-15240
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
omniauth-auth0RubyGems | >= 2.3.0, < 2.4.1 | 2.4.1 |
Affected products
3cpe:2.3:a:auth0:omniauth-auth0:*:*:*:*:*:ruby:*:*+ 1 more
- cpe:2.3:a:auth0:omniauth-auth0:*:*:*:*:*:ruby:*:*range: >=2.3.0,<2.4.1
- (no CPE)range: >= 2.3.0, <2.4.1
Patches
Vulnerability mechanics
References
6- github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7anvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-58r4-h6v8-jcvmghsaADVISORY
- github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvmnvdThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2020-15240ghsaADVISORY
- rubygems.org/gems/omniauth-auth0nvdProductVendor AdvisoryWEB
- github.com/rubysec/ruby-advisory-db/blob/master/gems/omniauth-auth0/CVE-2020-15240.ymlghsaWEB
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