PT-2026-77175 · Mybb · Mybb
CVE-2026-45121
·
Published
2026-08-18
·
Updated
2026-08-18
CVSS v3.1
4.3
Medium
| Vector | AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
Name of the Vulnerable Software and Affected Versions
MyBB versions prior to 1.8.40
Description
The calendar module fails to consistently verify permissions when listing calendars. This allows authenticated users to view the titles of calendars that should be inaccessible. The issue occurs within the calendar-selection paths in the
calendar.php file, which perform permission checks against an invalid calendar context before returning the titles.Recommendations
Update to version 1.8.40.
Exploit
Fix
Incorrect Authorization
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Weakness Enumeration
Related Identifiers
Affected Products
Mybb