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CVE-2026-33209 — Vulnerability in avo — CVE Details

MEDIUM

Avo has a XSS vulnerability on `return_to` param

Published March 18, 2026Updated March 25, 2026Source: osv

Summary

## Description 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. ## Impact This vulnerability may allow execution of arbitrary JavaScript in the context of the application. Impact varies depending on deployment: - In unauthenticated setups: exploitable via crafted links sent to users - In authenticated setups: limited to authenticated users and requires interaction

Advisory Timeline

  • First published March 18, 2026 (208 days ago).
  • Last revised March 25, 2026 — 7 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Bundler
Update avo to 3.30.3 or later
gem install avo -v 3.30.3

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: rubygems (1).

PackageEcosystemAffectedFixed In
avo
rubygems
0.2.0, 0.2.1, 0.2.2, 0.2.3 (+561 more)3.30.3

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

  • CWE-79
    Cross-site Scripting (XSS)MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 6.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
—
Confidentiality
—
Integrity
—
Availability
—

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

References

Frequently Asked Questions

What is CVE-2026-33209?
Avo has a XSS vulnerability on `return_to` param This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 6.1/10).
How do I check if my project is affected by CVE-2026-33209?
CVE-2026-33209 affects avo. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-33209 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
6.1

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-762r-27w2-q22j

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