Rails has a possible XSS vulnerability in its Action Pack debug exceptions
### 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).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-33167US | medium6.1 | — | ||
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 ex… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/rails/railsPACKAGE
- https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0WEB
- https://github.com/rails/rails/releases/tag/v8.1.2.1WEB
- https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2026-33167.ymlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-33167ADVISORY
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