CVE-2023-53977 MEDIUM

CVE-2023-53977: myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management

Vendor Mybb

Product myBB forums

Weakness CWE-79 · XSS

Published December 22, 2025

Last update April 7, 2026

View on NVD All CVEs

CVSS base score

5.1/10

Attack vector Network

Attack complexity Low

Privileges required Low

User interaction —

Confidentiality —

Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

What the vulnerability does

01Description

myBB Forums 1.8.26 contains a stored cross-site scripting vulnerability in the forum management system that allows authenticated administrators to inject malicious scripts when creating new forums. Attackers can exploit this vulnerability by inserting script payloads in the forum title field when adding new forums through the 'Forums and Posts' > 'Forum Management' interface, causing arbitrary JavaScript to execute when the forum listing is viewed.

Key dates

02Disclosure timeline

December 22, 2025 CVE published

April 7, 2026 Record updated

External resources

03References

NVD — National Vulnerability Database https://nvd.nist.gov/vuln/detail/CVE-2023-53977 CWE — Common Weakness Enumeration https://cwe.mitre.org/data/definitions/79.html