CVE-2026-45126
LOW
3,5
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: low
User Interaction: required
Scope: unchanged
Confidentiality: none
Integrity: low
Availability: none
Description
AI Translation Available
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.
352
Cross-Site Request Forgery (CSRF)
StableCommon Consequences
Security Scopes Affected:
Confidentiality
Integrity
Availability
Non-Repudiation
Access Control
Potential Impacts:
Gain Privileges Or Assume Identity
Bypass Protection Mechanism
Read Application Data
Modify Application Data
Dos: Crash, Exit, Or Restart
Applicable Platforms
Technologies:
Web Based, Web Server
https://github.com/mybb/mybb/commit/6893b395c7fa3b9e4de6235caea0ce198c376c4f
https://github.com/mybb/mybb/releases/tag/mybb_1840
https://github.com/mybb/mybb/security/advisories/GHSA-m42q-vgx3-fqcc
https://mybb.com/versions/1.8.40