What’s Vulnerable › Vulnerabilities

CVE-2020-36599: OmniAuth's `lib/omniauth/failure_endpoint.rb` does not escape `message_key` value

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-08-18 · updated 2026-06-17
• Weakness: CWE-116

Description

lib/omniauth/failure_endpoint.rb in OmniAuth before 1.9.2 (and before 2.0) does not escape the message_key value.

Affected products

• omniauth ruby gem: before 1.9.2; 2.0.0-pre.rc1 — fixed in 1.9.2
• Rubygems Omniauth: before 1.9.2; from 2.0.0.pre.rc1 before 2.0.0; 0.0.1, 0.0.3, 0.0.4, 0.0.5, 0.1.0, 0.1.1 (+53) — fixed in 1.9.2, 2.0.0

How to fix

Upgrade to a fixed version: omniauth ruby gem 1.9.2; Rubygems Omniauth 1.9.2, 2.0.0. Check the vendor advisory for mitigations.

References

• https://github.com/omniauth/omniauth/commit/43a396f181ef7d0ed2ec8291c939c95e3ed3ff00#diff-575abda9deb9b1a77bf534e898a923029b9a61e991d626db88dc6e8b34260aa2
• https://rubygems.org/gems/omniauth/versions/1.9.2
• https://github.com/omniauth/omniauth/commit/43a396f181ef7d0ed2ec8291c939c95e3ed3ff00#diff-575abda9deb9b1a77bf534e898a923029b9a61e991d626db88dc6e8b34260aa2
• https://rubygems.org/gems/omniauth/versions/1.9.2

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