Vulnerability 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.
CVSS Score
LOW
Related Weaknesses (CWE)
References
- 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
FAQ
What is CVE-2026-45126?
CVE-2026-45126 is a vulnerability with a CVSS score of 3.5 (LOW). 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 ...
How severe is CVE-2026-45126?
CVE-2026-45126 has been rated LOW with a CVSS base score of 3.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45126?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.