github.com
https://github.com/rails/rails CVE-2026-33167
LOW
Rails has a possible XSS vulnerability in its Action Pack debug exceptions
Record summary
CVE-2026-33167 has a selected CVSS score of 1.3 (low).
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.
Description source: CVE List
Exploitation context
CISA SSVC decision
ExploitationNone
AutomatableNo
Technical impactPartial
CISA Coordinator · SSVC 2.0.3 · Evaluated Mar 24, 2026 · Source: CVE List
Affected products and versions
2| Product | Source | Version range | Status |
|---|---|---|---|
actionpackBrowse rails / actionpack | CVE List | >= 8.1.0, < 8.1.2.1 | affected |
actionpackBrowse RubyGems / actionpack | GitHub Advisory | 8.1.0 to < 8.1.2.1 · Fixed in 8.1.2.1 | affected |
References
6github.com
https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0 github.com
https://github.com/rails/rails/releases/tag/v8.1.2.1 github.comConfirmation
https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6 github.com
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2026-33167.yml nvd.nist.gov
https://nvd.nist.gov/vuln/detail/CVE-2026-33167