Medium 5.3Published Mar 20, 2026

CVE-2026-33209Avo has a XSS vulnerability on `return_to` param

Updated under an hour ago (Oct 26, 2026, 3:50 PM ET)

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It affects avo-hq avo and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Mar 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

avo-hq avo avo_hq:avo (from the name)	before 3.30.3	CNA record
avohq avo avohq:avo	before 3.30.3	NVD

References

References

https://github.com/avo-hq/avo/security/advisories/GHSA-762r-27w2-q22j	x-refsource-confirm, vendor-advisory
https://github.com/avo-hq/avo/pull/4330	x-refsource-misc, issue-tracking, patch
https://github.com/avo-hq/avo/commit/4453d39ddc6309f3bc8ada73ef21e1971112de7d	x-refsource-misc, patch
https://github.com/avo-hq/avo/releases/tag/v3.30.3	x-refsource-misc, product, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.