CVE-2026-58054

HIGHPre-NVD 7.27.2—
EchelonGraph scoreHIGH confidence

Score 7.2 from GitHub Security Advisory (severity: HIGH) published 2026-06-28. a secondary CVSS source baseline 7.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.2
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.2Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
7.2
EG Score
7.2(high)
EPSS
19.0%
KEV
Not listed

Published

June 28, 2026

Last Modified

June 29, 2026

Advisory Details (2)

Auto-updated Jun 28, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

MyBB - Privilege Escalation from Limited ACP User Management to Administrator | Advisories | VulnCheck

https://www.vulncheck.com/advisories/mybb-privilege-escalation-from-limited-acp-user-management-to-administrator
generic🟡 PoC Available

exploitarium/mybb-limited-acp-to-admin at main · bikini/exploitarium · GitHub

https://github.com/bikini/exploitarium/tree/main/mybb-limited-acp-to-admin

Vendor Advisories for CVE-2026-58054(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 36× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 19:15 UTCEG score recompute
  2. 2026-07-06 19:15 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 16:27 UTCEPSS rescore
  5. 2026-07-06 06:11 UTCEG score recompute
  6. 2026-07-06 06:11 UTCGHSA enrichment
  7. 2026-07-06 02:23 UTCEPSS rescore
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 16:59 UTCEG score recompute
  10. 2026-07-05 16:59 UTCGHSA enrichment
  11. 2026-07-05 03:57 UTCEG score recompute
  12. 2026-07-05 03:57 UTCGHSA enrichment
  13. 2026-07-05 02:31 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 14:49 UTCEG score recompute
  16. 2026-07-04 14:49 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 01:47 UTCEG score recompute
  20. 2026-07-04 01:47 UTCGHSA enrichment
  21. 2026-07-03 12:45 UTCEG score recompute
  22. 2026-07-03 12:45 UTCGHSA enrichment
  23. 2026-07-02 23:36 UTCEG score recompute
  24. 2026-07-02 23:36 UTCGHSA enrichment
  25. 2026-07-02 10:35 UTCEG score recompute
Show 21 more
  1. 2026-07-02 10:34 UTCGHSA enrichment
  2. 2026-07-01 21:29 UTCEG score recompute
  3. 2026-07-01 21:29 UTCGHSA enrichment
  4. 2026-07-01 15:07 UTCEPSS rescore
  5. 2026-07-01 08:27 UTCEG score recompute
  6. 2026-07-01 08:27 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 19:23 UTCEG score recompute
  9. 2026-06-30 19:23 UTCGHSA enrichment
  10. 2026-06-30 06:21 UTCEG score recompute
  11. 2026-06-30 06:21 UTCGHSA enrichment
  12. 2026-06-29 17:19 UTCEG score recompute
  13. 2026-06-29 17:19 UTCGHSA enrichment
  14. 2026-06-29 14:06 UTCEPSS rescore
  15. 2026-06-29 04:16 UTCEG score recompute
  16. 2026-06-29 04:16 UTCGHSA enrichment
  17. 2026-06-28 15:13 UTCEG score recompute
  18. 2026-06-28 15:12 UTCGHSA enrichment
  19. 2026-06-28 14:07 UTCEPSS rescore
  20. 2026-06-28 02:10 UTCEG score recompute
  21. 2026-06-28 02:09 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-58054?
CVE-2026-58054 is a high vulnerability published on June 28, 2026. 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…
When was CVE-2026-58054 disclosed?
CVE-2026-58054 was first published in the National Vulnerability Database on June 28, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-58054 actively exploited?
CVE-2026-58054 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-58054?
CVE-2026-58054 has a CVSS v3 base score of 7.2 (NVD).
How do I remediate CVE-2026-58054?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-58054, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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