GHSA-pgm4-439c-5jp6
Rails has a possible XSS vulnerability in its Action Pack debug exceptions
At a glance
- Published
- Updated
- CVE
- CVE-2026-33167
- CVSS_V4
- CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:U
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](https://hackerone.com/fbettag).
Affected packages
| Package | Versions |
|---|---|
| RubyGems · actionpack | introduced 8.1.0, fixed 8.1.2.1 |
References
- https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33167 ADVISORY
- https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0 WEB
- https://github.com/rails/rails PACKAGE
- https://github.com/rails/rails/releases/tag/v8.1.2.1 WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2026-33167.yml WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |