Cross-site scripting in Ruby on Rails - CVE-2026-33170
Published: March 24, 2026
Vulnerability identifier: #VU124272
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2026-33170
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data within SafeBuffer#% in Active Support. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Ruby on Rails
Debian Linux
rails (Debian package)
Debian Linux
rails (Debian package)
How to mitigate CVE-2026-33170
Install updates from vendor's website.
Ruby on Rails - addressed in versions 7.2.3.1, 8.0.4.1, 8.1.2.1
rails (Debian package) - update to 2:7.2.2.2+dfsg-2~deb13u2
rails (Debian package) - update to 2:7.2.2.2+dfsg-2~deb13u2