XSS in Avo-hq Avo

CVE-2026-33209

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 mali…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.003 (18.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-33209?
CVE-2026-33209 is a medium-severity vulnerability in Avo-hq Avo, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-03-20.
How severe is CVE-2026-33209?
Medium severity. CVSS v3 base score is 6.1 out of 10.