CVE-2026-33209CWE-79

Avo has a XSS vulnerability on `return_to` param

Medium · published March 20, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
26.9
In the wild
Unconfirmed
What it is

Avo is a framework to create admin panels for Ruby on Rails apps. Prior to version 3.30.3, a reflected cross-site scripting (XSS) vulnerability exists in the return_to query parameter used in the avo interface. An attacker can craft a malicious URL that injects arbitrary JavaScript, which is executed when he clicks a dynamically generated navigation button. This issue has been patched in version 3.30.3.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00346 · 26.9th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-03-20T22:39Z
EPSS history
Timeline
  • 20 MAR 22:39Z
    Avo has a XSS vulnerability on `return_to` param
    cvelistv5