CVE-2026-45126

Published: Aug 18, 2026Modified: Sep 8, 2026Deferred

3.5

Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

Exploitability: 2.1 / Impact: 1.4

Source: security-advisories@github.com (Secondary)

Description

MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Security Questions module does not validate the anti-CSRF token correctly, allowing same-site attackers to enable or disable registration challenge questions with a specially crafted URL. The controller processes GET requests for the disable and enable actions to modify mybb_questions.active without verifying the my_post_key token attached by the user interface. The uniquely identifying implementation details include admin/modules/config/questions.php. This issue is fixed in version 1.8.40.

Related CWEs

CWE-352

Cross-Site Request Forgery (CSRF)

The web application does not, or can not, sufficiently verify whether a well-formed, valid, consistent request was intentionally provided by the user who submitted the request.

References (4)

https://github.com/mybb/mybb/commit/6893b395c7fa3b9e4de6235caea0ce198c376c4f

Source: security-advisories@github.com

https://github.com/mybb/mybb/releases/tag/mybb_1840

Source: security-advisories@github.com

https://github.com/mybb/mybb/security/advisories/GHSA-m42q-vgx3-fqcc

Source: security-advisories@github.com

https://mybb.com/versions/1.8.40

Source: security-advisories@github.com

Timeline

No history available yet.