PT-2025-52715 · Unknown · Mybb Forums

Andrey Stoykov · CVE-2023-53978 · Published 2025-12-22 · Updated 2025-12-26

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions myBB Forums version 1.8.26

Description myBB Forums version 1.8.26 has a stored cross-site scripting issue in the forum announcement system. Authenticated administrators can inject malicious scripts when creating announcements. Attackers can exploit this by inserting script payloads in the announcement title field through the 'Forums and Posts' > 'Forum Announcements' interface. This causes arbitrary JavaScript to execute when the announcement is displayed on the forum. The vulnerable parameter is the announcement title.

Recommendations Administrators should avoid inserting script payloads in the announcement title field when adding announcements.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2023-53978

Affected Products

Mybb Forums

References · 9

• 🔥 https://exploit-db.com/exploits/51136 · Exploit
• 🔥 https://vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2023-53978 · Security Note
• https://osv.dev/vulnerability/CVE-2023-53978 · Vendor Advisory
• https://t.me/cveNotify/146895 · Telegram Post
• https://t.me/CVEtracker/40446 · Telegram Post
• https://twitter.com/CVEnew/status/2003233940400930961 · Twitter Post
• https://mybb.com · Note
• https://twitter.com/VulmonFeeds/status/2003272989836537986 · Twitter Post