PT-2025-52713 · Unknown · Mybb Forums

Andrey Stoykov · Published 2025-12-22 · Updated 2025-12-27 · CVE-2023-53976

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 template management system. Authenticated administrators can inject malicious scripts when creating new templates. An attacker can exploit this by inserting script payloads in the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface. This can lead to arbitrary JavaScript execution when the template is viewed.

Recommendations Apply a fix that sanitizes the template title field when adding new templates through the 'Templates and Style' > 'Templates' > 'Manage Templates' > 'Global Templates' interface.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2023-53976

Affected Products

Mybb Forums

References · 11

• 🔥 https://exploit-db.com/exploits/51136 · Exploit
• 🔥 https://vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-template-management · Exploit
• https://osv.dev/vulnerability/CVE-2023-53976 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-41866 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2023-53976 · Security Note
• https://t.me/CVEtracker/40444 · Telegram Post
• https://twitter.com/CVEnew/status/2003233942212936044 · Twitter Post
• https://twitter.com/VulmonFeeds/status/2003278109194244483 · Twitter Post
• https://mybb.com · Note
• https://t.me/cveNotify/146893 · Telegram Post
• https://t.me/cveNotify/146944 · Telegram Post