Vulnerability Details CVE-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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 16.7%
CVSS Severity
CVSS v3 Score 6.1
References
Products affected by CVE-2026-33167
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cpe:2.3:a:rubyonrails:rails:8.1.0
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cpe:2.3:a:rubyonrails:rails:8.1.1
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cpe:2.3:a:rubyonrails:rails:8.1.2