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    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.

    Published:Mar 23, 2026
    Last Modified:Aug 12, 2026
    EPS:Mar 23, 2026
    EPSS Score:0.00401
    CVSS Score:6.1

    Affected Products

    Vendor
    Rubyonrails
    Product
    Actionpack
    Vendor
    Rubyonrails
    Product
    Rails

    Exploits

    No exploit reference

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High