PT-2026-53086 · Undefined · Undefined

Published 2026-06-28 · Updated 2026-06-28 · CVE-2026-58054

NVD

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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 verify usergroup() unconditionally returns true. An admin holding only the delegated user-management permission can assign the Administrators group to an account and escalate to the full Administrator permission set.

Exploit

Fix

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

CVE-2026-58054

Affected Products

Undefined

References · 3

• 🔥 https://github.com/bikini/exploitarium/tree/main/mybb-limited-acp-to-admin · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-58054 · Security Note
• https://vulncheck.com/advisories/mybb-privilege-escalation-from-limited-acp-user-management-to-administrator · Note