CVE-2026-58054

highCVSS 7.2covered by 1 sourcefirst seen 2026-06-28

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.

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Exploitation outlook

Low exploitation risk0.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 19% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-58054: MyBB 1.8.40 does not restrict which usergroup a limited Admin Control Panel user may assign wh…nvd · 2026-06-28

External references

NVD record for CVE-2026-58054

CVE.org record

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