How severe is CVE-2026-33209?

CVE-2026-33209 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-33209 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33209?

CVE-2026-33209 affects Avohq Avo. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33209?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33209 have an EU (EUVD) identifier?

Yes. CVE-2026-33209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13873.

When was CVE-2026-33209 published?

CVE-2026-33209 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-33209

CVE-2026-33209 is a medium-severity vulnerability in Avohq Avo with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 5.3
EPSS exploit prediction: 0% (18th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13873
Weakness: CWE-79
Affected product: Avohq Avo
Published: 2026-03-20
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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 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.
How severe is CVE-2026-33209?: CVE-2026-33209 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-33209 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (18th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33209?: CVE-2026-33209 affects Avohq Avo. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33209?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33209 have an EU (EUVD) identifier?: Yes. CVE-2026-33209 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13873.
When was CVE-2026-33209 published?: CVE-2026-33209 was published on 2026-03-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:avohq:avo:*:*:*:*:*:ruby:*:*

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