EUVD-2026-61007Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
PR:L reflects same-site attacker needing a forum account; UI:R for required admin interaction; I:L for limited setting-toggle impact only.
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Cross-site request forgery in MyBB's Admin CP Security Questions module (versions prior to 1.8.40) permits same-site attackers to toggle registration challenge questions on or off by tricking an authenticated administrator into visiting a specially crafted URL. The vulnerable controller in admin/modules/config/questions.php accepted GET requests for enable and disable actions and directly modified the mybb_questions.active database field without calling verify_post_check() against the my_post_key anti-CSRF token. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three concurrent conditions: (1) the attacker must be a same-site actor - either a registered forum user or someone able to cause the admin's browser to issue a request from the same web origin; (2) an administrator must be authenticated to the MyBB Admin CP in the same browser session and must be induced to follow the crafted URL (UI:R); and (3) the target MyBB installation must be running a version prior to 1.8.40 with the Security Questions module present. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 3.5 (Low) accurately reflects the constrained real-world risk: the only achievable outcome is toggling the active status of registration bot-protection challenge questions, with no confidentiality or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to MyBB 1.8.40 or later, which is the vendor-released patch confirmed at https://mybb.com/versions/1.8.40 and https://github.com/mybb/mybb/releases/tag/mybb_1840. … Detailed patch versions, workarounds, and compensating controls in full report. |
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External POC / Exploit Code
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