MyBB up to 1.8.39 Mod CP Report Center modcp.php flist_reports permission

Summaryinfo

A vulnerability categorized as problematic has been discovered in MyBB up to 1.8.39. Affected by this vulnerability is an unknown functionality of the file modcp.php of the component Mod CP Report Center. Executing a manipulation of the argument flist_reports can lead to permission. This vulnerability appears as CVE-2026-45124. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in MyBB up to 1.8.39. This vulnerability affects an unknown functionality of the file modcp.php of the component Mod CP Report Center. The manipulation of the argument flist_reports with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect integrity. CVE summarizes:

MyBB is free and open source forum software. Prior to 1.8.40, the Mod CP Report Center does not check permissions consistently, allowing moderators without report-management permission to mark reports as resolved. The modcp.php?action=do_reports Mark Selected as Read handler is reachable with canmodcp even without canmanagereportedcontent or canmanagereportedposts. When no forums are in scope, $flist_reports is empty and the UPDATE mybb_reportedcontent query executes without the expected permission-based limitation. This issue is fixed in version 1.8.40.

The advisory is available at github.com. This vulnerability was named CVE-2026-45124 since 05/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/18/2026). This vulnerability is assigned to T1222 by the MITRE ATT&CK project.

By approaching the search of inurl:modcp.php it is possible to find vulnerable targets with Google Hacking.

Upgrading to version 1.8.40 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Name

• MyBB

Version

• 1.8.0
• 1.8.1
• 1.8.2
• 1.8.3
• 1.8.4
• 1.8.5
• 1.8.6
• 1.8.7
• 1.8.8
• 1.8.9
• 1.8.10
• 1.8.11
• 1.8.12
• 1.8.13
• 1.8.14
• 1.8.15
• 1.8.16
• 1.8.17
• 1.8.18
• 1.8.19
• 1.8.20
• 1.8.21
• 1.8.22
• 1.8.23
• 1.8.24
• 1.8.25
• 1.8.26
• 1.8.27
• 1.8.28
• 1.8.29
• 1.8.30
• 1.8.31
• 1.8.32
• 1.8.33
• 1.8.34
• 1.8.35
• 1.8.36
• 1.8.37
• 1.8.38
• 1.8.39

License

• open-source

Website

• Product: https://mybb.com/

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