CVE-2023-53977 - CVE House
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Status published Medium CVE-2023-53977

myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management

Vulnerability Description

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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Andrey Stoykov

References

More from Mybb

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CVE-2023-53979
MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
High 8.6
CVE-2023-53978
myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements
Medium 5.1
CVE-2023-53976
myBB Forums 1.8.26 Stored Cross-Site Scripting via Template Management
Medium 5.1

Affected Vendor

Affected Software

myBB forums
Vulnerable Versions:
1.8.26

Timeline

Official Publish: December 22nd, 2025
Last Modified: April 7th, 2026
Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact