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XSS vulnerability on return_to param

Moderate
Paul-Bob published GHSA-762r-27w2-q22j Mar 17, 2026

Package

bundler avo (RubyGems)

Affected versions

< 3.30.2

Patched versions

>= 3.30.3

Description

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

Severity

Moderate

CVE ID

CVE-2026-33209

Weaknesses

No CWEs

Credits