# CVE-2026-6909: ATutor Reflected XSS in /install/upgrade.php

Source: https://junglewise.ai/threats/cve-2026-6909-atutor-reflected-xss-in-install-upgrade-php  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-11. Updated: 2026-05-11  
License: CC BY 4.0 with a link back

CVE-2026-6909 · Severity: info · CVSS 5.1 · Published 2026-05-11

ATutor, an open-source learning management system used for online courses, contains a security flaw in its installation and upgrade component. An attacker can trick a user into clicking a malicious link, allowing the attacker to execute unauthorized scripts in the user's web browser. This could lead to the theft of session information or unauthorized actions performed on behalf of the user.

Technologies: [ATutor](https://junglewise.ai/threats/technologies/atutor). Vendors: [ATutor](https://junglewise.ai/threats/vendors/atutor).

## Quick answers

**Is CVE-2026-6909 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-6909 being exploited in the wild.

**How severe is CVE-2026-6909?** Informational severity, with a CVSS score of 5.1, published 11 May 2026.

**Which products and versions are affected?** ATutor 2.2.4.

**Is there a fix for CVE-2026-6909?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-6909 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-6909?** Check whether you run ATutor at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A reflected cross-site scripting (XSS) vulnerability exists in ATutor version 2.2.4 within the /install/upgrade.php script. The application fails to properly neutralize user-supplied input before including it in the generated web page. An unauthenticated remote attacker can exploit this by persuading a victim to visit a specially crafted URL. Successful exploitation allows the attacker to execute arbitrary JavaScript in the context of the victim's browser session. The product is no longer supported, and no patch is available.

## Affected products

- ATutor ATutor 2.2.4

## Timeline

- 2026-05-11: advisory: Advisory published by CERT Polska and NVD

## References

- [https://atutor.github.io/](https://atutor.github.io/)
- [https://cert.pl/en/posts/2026/05/CVE-2026-6909](https://cert.pl/en/posts/2026/05/CVE-2026-6909)

## Related threats

- [ATutor reflected XSS in preview.php popup parameter](https://junglewise.ai/threats/cve-2026-64972-atutor-reflected-xss-in-preview-php-popup-parameter)
- [ATutor reflected XSS in restore functionality](https://junglewise.ai/threats/cve-2026-64971-atutor-reflected-xss-in-restore-functionality)
- [ATutor stored cross-site scripting in user profile](https://junglewise.ai/threats/cve-2026-64970-atutor-stored-cross-site-scripting-in-user-profile)
- [ATutor IDOR in profile picture endpoints](https://junglewise.ai/threats/cve-2026-64969-atutor-idor-in-profile-picture-endpoints)
- [ATutor server-side request forgery in import functionality](https://junglewise.ai/threats/cve-2026-64968-atutor-server-side-request-forgery-in-import-functionality)