PT-2026-27254 · Rails+1 · Action Pack+1

Published 2026-03-23 · Updated 2026-03-23 · CVE-2026-33167

Mitre

CVSS v4.0

1.3

Low

AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U

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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-33167

GHSA-PGM4-439C-5JP6

Affected Products

Action Pack

Rails

References · 7

• https://osv.dev/vulnerability/GHSA-pgm4-439c-5jp6 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-33167 · Security Note
• https://github.com/rails/rails · Note
• https://github.com/rails/rails/releases/tag/v8.1.2.1 · Note
• https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6 · Note
• https://twitter.com/cyberbivash/status/2036222511508029523 · Twitter Post
• https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0 · Note