CVE-2023-23913: rails-ujs vulnerable to DOM Based Cross-site Scripting contenteditable HTML Elements

Severity: medium (CVSS 6.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-01-09 · updated 2026-06-17
Weakness: CWE-79

Description

There is a potential DOM based cross-site scripting issue in rails-ujs which leverages the Clipboard API to target HTML elements that are assigned the contenteditable attribute. This has the potential to occur when pasting malicious HTML content from the clipboard that includes a data-method, data-remote or data-disable-with attribute.

Affected products

Rubygems Actionview: from 5.1.0 before 6.1.7.3; from 7.0.0 before 7.0.4.3; 5.1.0, 5.1.1, 5.1.2, 5.1.2.rc1, 5.1.3, 5.1.3.rc1 (+112) — fixed in 6.1.7.3, 7.0.4.3
rails-ujs: from 6.1.7.3 before 6.1.7.3; from 7.0.4.3 before 7.0.4.3 — fixed in 6.1.7.3, 7.0.4.3

How to fix

Upgrade to a fixed version: Rubygems Actionview 6.1.7.3, 7.0.4.3; rails-ujs 6.1.7.3, 7.0.4.3. Check the vendor advisory for mitigations.

References

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