CVE-2017-20026 HumHub Reflected cross site scriting

Medium 4.3 Published 9 Jun 2022 Updated 15 Apr 2025

Remote attackers can execute arbitrary scripts in victims' browsers via reflected XSS in HumHub, potentially leading to session hijacking or data theft.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2017-20026?

CVE-2017-20026 is a medium-severity cross-site scripting vulnerability in unspecified HumHub, published on 9 Jun 2022. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability has been found in HumHub up to 1.0.1 and classified as problematic. Affected by this vulnerability is an unknown functionality. The manipulation leads to cross site scripting (Reflected). The attack can be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 1.1.1 is able to address this issue. It is recommended to upgrade the affected component.

Weakness: CWE-79, CWE-80

Which versions are affected by CVE-2017-20026?

It affects 1 product.

Products include Humhub Humhub.

How do I fix CVE-2017-20026?

No fix has been published for CVE-2017-20026 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2017-20026 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2017-20026 exists.

Sources

Also known as GHSA-m7qr-8cph-5cpw.