CVE-2026-33167

Description

Action Pack is a Rubygem for building web applications on the Rails framework. In versions on the 8.1 branch prior to 8.1.2.1, the debug exceptions page does not properly escape exception messages. A carefully crafted exception message could inject arbitrary HTML and JavaScript into the page, leading to XSS. This affects applications with detailed exception pages enabled (`config.consider_all_requests_local = true`), which is the default in development. Version 8.1.2.1 contains a patch.

References

https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6

https://github.com/rails/rails/releases/tag/v8.1.2.1

https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0

Details

Source: Mitre, NVD

Risk Information

CVSS v2

CVSS v3

CVSS v4

EPSS