Action Pack is a Rubygem for building web applications on the Rails framework.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Mar 23, 2026 · NIST NVD

   Detected

   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 ( ), which is the default

2. Aug 12, 2026 · NIST NVD

   Updated

   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 ( ), which is the default

Affected

• cpe rubyonrails/railsversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-33167

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-33167

  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 i

  nvd.nist.gov

References

• Patch · github.com
• Release Notes · github.com
• Vendor Advisory · github.com