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MyBB CVE-2026-45129

| EUVDEUVD-2026-61019 MEDIUM
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-18 GitHub_M
PHP CSRF Mybb
4.6
CVSS 3.1 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
4.6 MEDIUM
AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
vuln.today AI
4.6 MEDIUM

PR:L reflects same-site attacker requirement (registered forum member); UI:R because admin must click crafted link; C:N as no information is disclosed.

3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
Low

Lifecycle Timeline

3
Patch available
Aug 18, 2026 - 17:17 EUVD
Source Code Evidence Fetched
Aug 18, 2026 - 16:49 vuln.today
Analysis Generated
Aug 18, 2026 - 16:49 vuln.today

DescriptionCVE.org

MyBB is free and open source forum software. Prior to 1.8.40, the Admin CP Recovery Codes module does not validate requests correctly, allowing same-site attackers to rotate a victim administrator's recovery codes with a specially crafted URL. The Admin CP Home, Preferences, Recovery Codes action=recovery_codes page regenerates Two-Factor Authentication recovery codes in mybb_adminoptions.recovery_codes on GET requests without request forgery protection. The uniquely identifying implementation details include admin/modules/home/preferences.php. This issue is fixed in version 1.8.40.

AnalysisAI

Cross-site request forgery in MyBB's Admin CP Recovery Codes module allows same-site attackers to silently rotate a victim administrator's Two-Factor Authentication recovery codes by tricking them into loading a crafted URL. All MyBB installations prior to 1.8.40 are affected. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation The victim must be an authenticated MyBB administrator with an active Admin CP session at the time of the request. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS base score of 4.6 (Medium) with vector AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L accurately reflects the constrained impact: exploitation requires victim interaction (UI:R) and same-site attacker presence (PR:L). … 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 Vendor-released patch: MyBB 1.8.40, available 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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CVE-2026-45129 vulnerability details – vuln.today
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