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CVE Vulnerability Details :
CVE-2026-58054
PUBLISHED
More InfoOfficial Page
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
View Known Exploited Vulnerability (KEV) details
Published At-28 Jun, 2026 | 01:32
Updated At-29 Jun, 2026 | 13:03
Rejected At-
▼CVE Numbering Authority (CNA)
MyBB - Privilege Escalation from Limited ACP User Management to Administrator

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.

Affected Products
Vendor
MyBBMyBB
Product
MyBB
Default Status
affected
Versions
Affected
  • From 0 through 1.8.40 (semver)
Problem Types
TypeCWE IDDescription
CWECWE-269Improper Privilege Management
Type: CWE
CWE ID: CWE-269
Description: Improper Privilege Management
Metrics
VersionBase scoreBase severityVector
3.17.2HIGH
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
4.08.6HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Version: 3.1
Base score: 7.2
Base severity: HIGH
Vector:
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Version: 4.0
Base score: 8.6
Base severity: HIGH
Vector:
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
ashdfrkl
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/bikini/exploitarium/tree/main/mybb-limited-acp-to-admin
exploit
third-party-advisory
https://www.vulncheck.com/advisories/mybb-privilege-escalation-from-limited-acp-user-management-to-administrator
third-party-advisory
Hyperlink: https://github.com/bikini/exploitarium/tree/main/mybb-limited-acp-to-admin
Resource:
exploit
third-party-advisory
Hyperlink: https://www.vulncheck.com/advisories/mybb-privilege-escalation-from-limited-acp-user-management-to-administrator
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found