CVE-2026-33167
LOW EPSS 31.9%
Published Mar 23, 20263mo ago · Modified Jun 17, 20262w ago
1.3 CVSS 4.0
Published Mar 23, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction P
Scope X
Threat Intelligence
EPSS Exploit Probability
31.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
References 3
- github.com https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0
- github.com https://github.com/rails/rails/releases/tag/v8.1.2.1
- github.com https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.