CVE-2026-45124Network attack vector

Unauthorized report resolution via missing permission check

Published Aug 18, 2026 · Updated Aug 19, 2026

Authorization bypass in MyBB before 1.8.40 allows remote authenticated users to mark reported content as resolved via the Mod CP Report Center. In modcp.php, the do_reports handler accepted users with canmodcp but did not require canmanagereportedcontent, and an empty $flist_reports left the UPDATE mybb_reportedcontent query without its intended permission scope. Reachability requires moderator-level Mod CP access, and the consequence is limited to altering report state rather than gaining broader forum or administrative privileges.

CVSS severity4.3
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in MyBB before 1.8.40 allows remote authenticated users to mark reported content as resolved via the Mod CP Report Center. In modcp.php, the do_reports handler accepted users with canmodcp but did not require canmanagereportedcontent, and an empty $flist_reports left the UPDATE mybb_reportedcontent query without its intended permission scope. Reachability requires moderator-level Mod CP access, and the consequence is limited to altering report state rather than gaining broader forum or administrative privileges.

The record

CVE
CVE-2026-45124
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
MyBB
Product
MyBB
Classifications
CWE-862, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MyBB · MyBBversion=< 1.8.40

Published CVSS scores

4.3GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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