CVE-2026-33209 identifies a reflected Cross-Site Scripting (XSS) vulnerability in the Avo admin panel framework for Ruby on Rails, affecting versions prior to 3.30.3. This medium-severity flaw (CVSS 6.1) allows an unauthenticated attacker to inject arbitrary JavaScript into the `return_to` query parameter. Exploitation requires user interaction, where a victim clicks a specially crafted malicious URL, leading to the execution of arbitrary script in their browser context, potentially enabling session hijacking or data theft. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 3.30.3CPE matchmatch criteria | cpe:2.3:a:avohq:avo:*:*:*:*:*:ruby:*:* |
CVSS version used by this source: 4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.