Unrated severityNVD Advisory· Published Dec 22, 2025· Updated Apr 7, 2026
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
CVE-2023-53978
Description
myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.
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Affected products
2Patches
Vulnerability mechanics
References
3- www.exploit-db.com/exploits/51136mitreexploit
- www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcementsmitrethird-party-advisory
- mybb.commitreproduct
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