CVE-2021-44911

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-02-09 · updated 2026-06-17
Weakness: CWE-79

Description

XE before 1.11.6 is vulnerable to Unrestricted file upload via modules/menu/menu.admin.controller.php. When uploading the Mouse over button and When selected button, there is no restriction on the file suffix, which leads to any file uploading to the files directory. Since .htaccess only restricts the PHP type, uploading HTML-type files leads to stored XSS vulnerabilities.

Affected products

XpressEngine: before 1.11.6 — fixed in 1.11.6

How to fix

Upgrade to a fixed version: XpressEngine 1.11.6. Check the vendor advisory for mitigations.

References

https://github.com/xpressengine/xe-core/issues/2434
https://github.com/xpressengine/xe-core/issues/2434

Get alerted when CVE-2021-44911 or the next vulnerability affects your stack