GHSA-ph8x-wg86-qp2m: HumHub 1.19.0 - Stored cross-site scripting in friendship confirmation
HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded display name into a modal through jQuery html(), causing attacker-controlled markup to execute in the victim's HumHub origin.
Event History
Frequently Asked Questions
Who is exposed to this issue?
HumHub Community Edition 1.19.0 instances are exposed when authenticated users can view a vulnerable profile's Friends dialog. Both the attacker and the victim must be authenticated HumHub users; the attacker only needs low-privileged member access.
What user interaction is required for exploitation?
The attacker must first save HTML in their first or last name. A victim must then click Friends for the attacker's profile, which opens the friendship confirmation dialog and triggers execution of the stored markup.
What is the potential impact of successful exploitation?
Attacker-controlled markup executes in the victim's HumHub origin. The provided severity vector indicates high impact to confidentiality and integrity within the vulnerable component, with low impact to confidentiality and integrity of the subsequent system.