EUVD-2026-61009Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
PR:L reflects same-site delivery requiring a forum account; UI:R because an admin must actively click the link; C:N as no data is disclosed.
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 UTF-8 Conversion module does not validate certain requests correctly, allowing same-site attackers to alter table encoding and deny service with a specially crafted URL. The do=all control flow in admin/modules/tools/system_health.php performs ALTER TABLE operations, column rewrite phases, and fulltext index rebuilds on GET requests for the database table named by the table parameter without request verification. The uniquely identifying implementation details include GET requests without request verification. This issue is fixed in version 1.8.40.
AnalysisAI
CSRF in MyBB's Admin Control Panel UTF-8 Conversion module allows same-site attackers to trigger destructive database ALTER TABLE operations by luring an authenticated administrator into following a specially crafted GET URL. The do=all control flow in admin/modules/tools/system_health.php executed table encoding changes, column rewrites, and fulltext index rebuilds without any synchronizer-token verification, exposing any named database table to attacker-chosen manipulation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The victim must be an authenticated MyBB administrator with an active Admin CP session at the moment the crafted link is clicked - passive browsing or background requests cannot trigger the vulnerability. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 4.6 (Medium) accurately reflects the constrained risk profile: network-reachable (AV:N), low complexity (AC:L), low-privilege attacker (PR:L - consistent with the description's 'same-site attacker' qualifier implying a registered forum account), mandatory user interaction (UI:R - the admin must actively follow the link), and limited integrity and availability impact (I:L/A:L) with zero confidentiality exposure (C: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, the vendor-confirmed patch that introduces CSRF token verification in the do=all code path of admin/modules/tools/system_health.php; the release is 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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External POC / Exploit Code
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