Regression in JWT Signature Validation

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0080, the 56th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 3 Nov 2020. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-58r4-h6v8-jcvm
• OSV: GHSA-58r4-h6v8-jcvm
• github.com/auth0/omniauth-auth0/security/advisories/GHSA-58r4-h6v8-jcvm
• nvd.nist.gov/vuln/detail/CVE-2020-15240
• github.com/auth0/omniauth-auth0/commit/fd3a14f4ccdfbc515d1121d6378ff88bf55a7a7a
• github.com/auth0/omniauth-auth0
• github.com/rubysec/ruby-advisory-db/blob/master/gems/omniauth-auth0/CVE-2020-15240.yml
• rubygems.org/gems/omniauth-auth0

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.