CVE-2026-45124 MyBB: Mod CP report resolution missing authorization
Moderators without report-management permissions can mark reports as resolved in MyBB due to missing authorization checks.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-45124?
CVE-2026-45124 is a medium-severity missing authorization vulnerability in mybb, published on 18 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
MyBB is free and open source forum software. Prior to 1.8.40, the Mod CP Report Center does not check permissions consistently, allowing moderators without report-management permission to mark reports as resolved. The modcp.php?action=do_reports Mark Selected as Read handler is reachable with canmodcp even without canmanagereportedcontent or canmanagereportedposts. When no forums are in scope, $flist_reports is empty and the UPDATE mybb_reportedcontent query executes without the expected permission-based limitation. This issue is fixed in version 1.8.40.
Weakness: CWE-862
Which versions are affected by CVE-2026-45124?
How do I fix CVE-2026-45124?
No fix has been published for CVE-2026-45124 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-45124 being exploited?
There is no known exploitation of CVE-2026-45124 in the wild and no public exploit code.
Sources
Also known as GHSA-gfxj-g7w6-6w4v.