EUVD-2026-61016Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Network-accessible web app requiring only a low-privileged authenticated session; impact is limited to partial integrity corruption of buddy list metadata with no confidentiality or availability effect.
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 User CP Buddy/Ignore List component does not validate reciprocal buddy-list updates correctly. The usercp.php?action=do_editlists delete handler removes the selected entry from the acting user's list and then updates mybb_users.buddylist for the target account. The reciprocal update searches for the deleted target UID instead of the acting user's UID and uses the unchecked array_search() return value as an array key. A false result can be converted to index 0, removing the target account's first stored buddy while leaving the actual reciprocal entry unchanged. The uniquely identifying implementation details include false converted to index 0. This issue is fixed in version 1.8.40.
AnalysisAI
Buddy list integrity corruption in MyBB before 1.8.40 allows any authenticated forum member to silently remove an arbitrary entry from another user's buddy list as a side effect of their own list management. The root cause is an unchecked array_search() return value (CWE-252) combined with a wrong UID used in the reciprocal update - PHP coerces the false return to array index 0, clobbering the target account's first stored buddy. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires a valid authenticated session on the MyBB forum (low-privileged registered member account; no moderator or admin rights needed). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 4.3 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N) accurately characterizes the real-world risk as moderate-to-low. … 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-released patched version confirmed via the GitHub release tag mybb_1840 and advisory GHSA-w8gm-j57p-jqpc. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-252 – Unchecked Return Value
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External POC / Exploit Code
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