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Rails Active Support has a possible XSS vulnerability in SafeBuffer#%

🗓️ 23 Mar 2026 20:53:28Reported by GitHub Advisory DatabaseType 
github
 github
🔗 github.com👁 3 Views

Rails SafeBuffer#% XSS risk; html_unsafe flag not propagated after in-place mutations, bypassing ERB escaping.

Related
Detection
Refs
Vulners
Node
OR
activesupport_projectactivesupportRange8.0.0.beta18.0.4.1rubygems
OR
activesupport_projectactivesupportRange8.1.0.beta18.1.2.1rubygems

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13 May 2026 16:15Current
6.1Medium risk
Vulners AI Score6.1
CVSS 3.16.1
CVSS 45.3
EPSS0.00011
SSVC
3