CVE-2026-33168
LowCVSS 2.3Summary
Action View provides conventions and helpers for building web pages with the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when a blank string is used as an HTML attribute name in Action View tag helpers, the attribute escaping is bypassed, producing malformed HTML. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS.
Risk Assessment
Applications that allow users to specify custom HTML attributes may be exposed to XSS attacks, enabling execution of malicious script in a victim's browser.
Recommendation
Update Action View to version 8.1.2.1, 8.0.4.1, or 7.2.3.1 (or later) and restrict users' ability to define custom HTML attributes.
Other vulnerabilities in Action View
Original NVD description (English source)
Action View provides conventions and helpers for building web pages with the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, when a blank string is used as an HTML attribute name in Action View tag helpers, the attribute escaping is bypassed, producing malformed HTML. A carefully crafted attribute value could then be misinterpreted by the browser as a separate attribute name, possibly leading to XSS. Applications that allow users to specify custom HTML attributes are affected. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS