CVE-2026-58054

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority. This CVE was assigned on the basis that the permission system allows a limited administrator to grant privileges exceeding their own authorization scope, potentially constituting an insecure default...

CVE-2026-58054

CVE-2026-58054 is not a public vulnerability in practice; however, connected details describe a concrete issue in MyBB 1.8.40 where a limited ACP user can assign the Administrators (gid 4) group because verify_usergroup() unconditionally returns true for that group. This enables privilege escalat...

EUVD-2026-39974

MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign when creating or editing users; the user module offers the Administrators group gid 4 and its datahandler's verifyusergroup unconditionally returns true. An admin holding only the delegated user-management...

PT-2026-53086

Name of the Vulnerable Software and Affected Versions MyBB version 1.8.40 Description An issue exists where users with limited Admin Control Panel ACP access can assign any usergroup to an account during creation or editing. This occurs because the verify usergroup function in the user module...