Rails has a possible XSS vulnerability in its Action View tag helpers

FAIBLE 2.3CVE-2026-33168 · GHSA-v55j-83pf-r9cq · Published 23/03/2026 · updated 17/06/2026

En bref

CVE-2026-33168 est une vulnérabilité FAIBLE (CVSS 2.3) touchant actionview.
Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 0.68%, plus élevée que 52.3% des vulnérabilités.
Correctif : mettre à jour vers 8.0.4.1, 8.1.2.1, 7.2.3.1 ou plus récent.

Package	Affected versions	Patched versions
actionview RubyGems	`≥ 8.0.0.beta1, < 8.0.4.1≥ 8.1.0.beta1, < 8.1.2.1< 7.2.3.1`	`8.0.4.18.1.2.17.2.3.1`

Description

Impact

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.

Releases

The fixed releases are available at the normal locations.

Credit

This issue was responsibly reported by Hackerone researcher taise.

NVD description

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.