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MyBB CVE-2026-45127

| EUVDEUVD-2026-60977 LOW
Cross-Site Request Forgery (CSRF) (CWE-352)
2026-08-18 GitHub_M
PHP CSRF Mybb
3.5
CVSS 3.1 · Vendor: GitHub_M

Severity by source

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

Admin authentication required (PR:L), user must click crafted link (UI:R), impact limited to draft-entry creation with no confidentiality or availability loss (I:L only).

3.1 AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:L/VA:N/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
None

Lifecycle Timeline

3
Source Code Evidence Fetched
Aug 18, 2026 - 16:47 vuln.today
Analysis Generated
Aug 18, 2026 - 16:47 vuln.today
Patch available
Aug 18, 2026 - 16:17 EUVD

DescriptionCVE.org

MyBB is free and open source forum software. Prior to 1.8.40, the ACP Mass Mail module does not validate certain requests correctly, allowing same-site attackers to create draft entries from archived entries by embedding a specially crafted URL. The Resend route in Admin CP, Users & Groups, Mass Mail, Mass Mailing Archive duplicates archived mailing entries into new drafts with mybb_massemails.status set to 0 on GET requests without request forgery protection. The uniquely identifying implementation details include Users & Groups → Mass Mail → Mass Mailing Archive, mybb_massemails.status = 0, and admin/modules/user/mass_mail.php. This issue is fixed in version 1.8.40.

AnalysisAI

Cross-site request forgery in MyBB's Admin CP Mass Mail module (versions prior to 1.8.40) allows same-site attackers to manipulate an authenticated administrator's session to create draft mass mail entries from archived ones. The Resend route under Users & Groups → Mass Mail → Mass Mailing Archive processed GET requests and performed state-changing database writes (setting mybb_massemails.status = 0) without any CSRF token verification, enabling forged requests via a specially crafted URL. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

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Vulnerability AssessmentAI

Exploitation The victim must be an authenticated MyBB administrator actively logged into the Admin Control Panel (ACP) at the time the crafted URL is visited - this is the PR:L constraint reflected in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The NVD CVSS 3.1 score of 3.5 (Low) is consistent with the actual attack surface: AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N. … 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, which contains the complete fix. … Detailed patch versions, workarounds, and compensating controls in full report.
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CVE-2026-45127 vulnerability details – vuln.today
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