CVEvulnerability

CVE-2026-45120

5.4 MEDIUM Published 2026-08-18 Modified 2026-09-08 Official page ↗

Status: Deferred
Published: 2026-08-18
Last modified: 2026-09-08
Assigner: [email protected]
CVSS 3.1 ([email protected]): 5.4 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weaknesses: CWE-639

Description

MyBB is free and open source forum software. Prior to 1.8.40, the calendar module does not verify private event status consistently, allowing users with viewing and moderation permissions to access and moderate private events. The private-event check used by get_events() in inc/functions_calendar.php and the event action is missing from the remaining calendar.php actions, despite the limited-access behavior described in inc/languages/english/calendar.lang.php. This issue is fixed in version 1.8.40.

Weakness · CWE (1)

CWE-639 Authorization Bypass Through User-Controlled Key weakness

References

https://github.com/mybb/mybb/commit/c077e6c29755187c4df78a1e674dd61bc55701b3 github.com
https://github.com/mybb/mybb/releases/tag/mybb_1840 github.com
https://github.com/mybb/mybb/security/advisories/GHSA-c2hm-g9w6-pv6x github.com
https://mybb.com/versions/1.8.40 mybb.com

CVE-2026-45120

Description

Related

Weakness · CWE (1)

References