CVE-2026-33167

Name	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
rails (PTS)	bullseye	2:6.0.3.7+dfsg-2+deb11u2	fixed
	bullseye (security)	2:6.0.3.7+dfsg-2+deb11u4	fixed
	bookworm, bookworm (security)	2:6.1.7.10+dfsg-1~deb12u2	fixed
	trixie (security), trixie	2:7.2.2.2+dfsg-2~deb13u1	fixed
	forky	2:7.2.3+dfsg-3	fixed
	sid	2:7.2.3.1+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
rails	source	(unstable)	(not affected)

Notes

- rails <not-affected> (Vulnerable code not present)
https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6
Fixed by: https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0 (v8.1.2.1)