CVE-2026-33167

Summary

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.

Affected Software

Weaknesses

• CWE-79: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: partial

References

• https://github.com/rails/rails/security/advisories/GHSA-pgm4-439c-5jp6
• https://github.com/rails/rails/commit/6752711c8c31d79ba50d13af6a6698a3b85415e0
• https://github.com/rails/rails/releases/tag/v8.1.2.1

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