Cross-site Scripting (XSS)

Overview activesupport is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Affected versions of this package are vulnerable to Cross-site Scripting XSS via the @htmlunsafe flag used by the SafeBuffer% function. An attacker can inject scripts by providing...

UBUNTU-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 @htmlunsafe flag to the newly created buffer. If a SafeBuffer is mutated in place e.g. via gsub! and th...

GHSA-89VF-4333-QX8V Rails Active Support has a possible XSS vulnerability in SafeBuffer#%

Impact SafeBuffer% does not propagate the @htmlunsafe flag to the newly created buffer. If a SafeBuffer is mutated in place e.g. via gsub! and then formatted with % using untrusted arguments, the result incorrectly reports htmlsafe? == true, bypassing ERB auto-escaping and possibly leading to XSS...

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

Impact SafeBuffer% does not propagate the @htmlunsafe flag to the newly created buffer. If a SafeBuffer is mutated in place e.g. via gsub! and then formatted with % using untrusted arguments, the result incorrectly reports htmlsafe? == true, bypassing ERB auto-escaping and possibly leading to XSS...