CVE-2026-33209
Reflected XSS in Avo Framework's return_to Parameter
Publication date: 2026-03-20
Last updated on: 2026-03-23
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| avohq | avo | to 3.30.3 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability is a reflected cross-site scripting (XSS) issue in the Avo framework for Ruby on Rails applications, specifically in the return_to query parameter used in the Avo interface.
An attacker can create a malicious URL that injects arbitrary JavaScript code. When a user clicks a dynamically generated navigation button that uses this parameter, the injected script is executed in the user's browser.
This vulnerability was present in versions prior to 3.30.3 and has been fixed in version 3.30.3.
How can this vulnerability impact me? :
This reflected XSS vulnerability can allow attackers to execute arbitrary JavaScript in the context of the affected application.
- Steal sensitive information such as cookies or session tokens.
- Perform actions on behalf of the user without their consent.
- Redirect users to malicious websites.
- Potentially compromise the security and integrity of the application and its users.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
To mitigate this vulnerability, you should upgrade the Avo framework to version 3.30.3 or later, where the reflected cross-site scripting (XSS) issue in the return_to query parameter has been patched.