XSS in Rails Activesupport
CVE-2026-33170
Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created b…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (1.5th percentile) — read the EPSS interpretation.
Affected products
- Rails Activesupport — versions >= 8.1.0.beta1, < 8.1.2.1, >= 8.0.0.beta1, < 8.0.4.1, < 7.2.3.1
Weakness classification (CWE)
References
- https://github.com/rails/rails/security/advisories/GHSA-89vf-4333-qx8v (x_refsource_CONFIRM)
- https://github.com/rails/rails/commit/50d732af3b7c8aaf63cbcca0becbc00279b215b7 (x_refsource_MISC)
- https://github.com/rails/rails/commit/6e8a81108001d58043de9e54a06fca58962fc2db (x_refsource_MISC)
- https://github.com/rails/rails/commit/c1ad0e8e1972032f3395853a5e99cea035035beb (x_refsource_MISC)
- https://github.com/rails/rails/releases/tag/v7.2.3.1 (x_refsource_MISC)
- https://github.com/rails/rails/releases/tag/v8.0.4.1 (x_refsource_MISC)
- https://github.com/rails/rails/releases/tag/v8.1.2.1 (x_refsource_MISC)