CVE-2026-45128 MyBB: ACP Users View Manager default CSRF
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-45128?
CVE-2026-45128 is a low-severity vulnerability in mybb, published on 18 Aug 2026.
Official description
MyBB is free and open source forum software. Prior to 1.8.40, the ACP Users View Manager module does not validate requests correctly, allowing same-site attackers to change a victim administrator's default user list view by embedding a specially crafted URL. The Set as Default control named set_default in Admin CP, Users & Groups, Users, View Manager changes the administrator's default view on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Users → View Manager, and admin/inc/functions_view_manager.php. This issue is fixed in version 1.8.40.
Weakness: CWE-352
Which versions are affected by CVE-2026-45128?
How do I fix CVE-2026-45128?
No fix has been published for CVE-2026-45128 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-45128 being exploited?
There is no known exploitation of CVE-2026-45128 in the wild and no public exploit code.
Sources
Also known as GHSA-m6hr-25cj-p58q.