CVE-2026-45122
Last modified
CVE-2026-45122 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not validate moderation permissions for the destination calendar when moving events. EPSS estimates a 0.25% chance of exploitation in the next 30 days.
Description
MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not validate moderation permissions for the destination calendar when moving events. A user with moderation permission for the source calendar can move an event to a calendar where the user has only viewing permission because the do_move action in calendar.php does not check canmoderateevents for the target calendar. The uniquely identifying implementation details include calendar event move, source calendar moderation permission, and destination calendar viewing permission. This issue is fixed in version 1.8.40.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| mybb | mybb | < 1.8.40 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
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