VULNERABILITY INTELLIGENCE

CVE-2026-33167

CVSS score6.1 MEDIUM
EPSS probability0.26%
CISA KEVNot currently listed
Published2026-03-23
Last modified2026-08-12
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

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.

Weakness classification

  • security-advisories@github.com: CWE-79

Primary references