CVE-2026-33209: Avo is a framework to create admin panels for Ruby on Rails apps

Q: How do I fix CVE-2026-33209?

avo: upgrade to 3.30.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-33209 being exploited?

CVE-2026-33209 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-33209 affect?

CVE-2026-33209 affects avo. Severity is medium (CVSS 6.1). 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 malic

Q: How urgent is CVE-2026-33209?

Priority 26/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-33209 is a medium-severity flaw (CVSS 6.1) affecting avo. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: avohq

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-20 23:16 UTCPublished CVE record published
2026-06-17 10:37 UTCUpdated Record last modified

avohq avo UPGRADE

Affected: < 3.30.3

Fixed in: 3.30.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy avo || rpm -q avo || avo --version

2. UPGRADE to 3.30.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade avo

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade avo

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-33209?

avo: upgrade to 3.30.3. Exact commands for each OS are on this page.

Is CVE-2026-33209 being exploited?

CVE-2026-33209 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-33209 affect?

CVE-2026-33209 affects avo. Severity is medium (CVSS 6.1). 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 malic

How urgent is CVE-2026-33209?

Priority 26/100. No elevated risk signals yet.

Software pages

Ruby on Rails vulnerabilities · Ruby vulnerabilities

References

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