What is GHSA-pgm4-439c-5jp6?

GHSA-pgm4-439c-5jp6 is a security advisory published by GitHub Security Advisories with Low severity. Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Which CVE IDs does GHSA-pgm4-439c-5jp6 cover?

GHSA-pgm4-439c-5jp6 covers the following CVE IDs: CVE-2026-33167. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-pgm4-439c-5jp6?

GHSA-pgm4-439c-5jp6 affects 1 product, including: rubygems/actionpack:\u003e= 8.1.0, \u003c 8.1.2.1.

GHSA-pgm4-439c-5jp6Low

Rails has a possible XSS vulnerability in its Action Pack debug exceptions

Vendor

GitHub Security Advisories

Published

March 23, 2026

Last Modified

May 13, 2026

🔗 CVE IDs covered (1)

CVE-2026-33167 →

📋 Description

Impact

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.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by Hackerone researcher fbettag.

🎯 Affected products1

rubygems/actionpack:>= 8.1.0, < 8.1.2.1

🔗 References (6)

https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6
https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0
https://github.com/rails/rails/releases/tag/v8.1.2.1
https://nvd.nist.gov/vuln/detail/CVE-2026-33167
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2026-33167.yml
https://github.com/advisories/GHSA-pgm4-439c-5jp6