Vulnerability advisory
CVE-2026-33167
Rails has a possible XSS vulnerability in its Action Pack debug exceptions
Also known as GHSA-pgm4-439c-5jp6
Severity
- CVSS 4.0
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
Affected versions
Repository
| Affected commits | Fixed by commit |
|---|---|
| GIT github.com/rails/rails ↗ | |
| 1cdd190a25e483b65f1f25bbd0f13a25d696b461 to before 1db4b89687cc18311fc3f92623136705df24e671 | 1db4b89687cc18311fc3f92623136705df24e671 |
| Not specified | 6752711c8c31d79ba50d13af6a6698a3b85415e0 |
Also listed as affected (3)
| |
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.
References
- Webgithub.com/rails/rails/releases/tag/v8.1.2.1 ↗
- Advisorygithub.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33167.json ↗
- Advisorygithub.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6 ↗
- Advisorynvd.nist.gov/vuln/detail/CVE-2026-33167 ↗
- Fixgithub.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0 ↗