CVE-2023-53977

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.

CVSS v3 5.4 MEDIUM

5.4^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.3 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://mybb.com/	Product
https://www.exploit-db.com/exploits/51136	Exploit
https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management	Exploit Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:mybb:mybb:1.8.26:*:*:*:*:*:*:*

History

27 Dec 2025, 17:15

Type	Values Removed	Values Added
References	~~() https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management - Third Party Advisory, Exploit~~	() https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management - Exploit, Third Party Advisory
CVSS	v2 : ~~unknown~~ v3 : ~~6.4~~	v2 : unknown v3 : 5.4

26 Dec 2025, 16:04

Type	Values Removed	Values Added
First Time		Mybb Mybb mybb
CPE		cpe:2.3:a:mybb:mybb:1.8.26:::::::*
References	~~() https://mybb.com/ -~~	() https://mybb.com/ - Product
References	~~() https://www.exploit-db.com/exploits/51136 -~~	() https://www.exploit-db.com/exploits/51136 - Exploit
References	~~() https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management -~~	() https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management - Third Party Advisory, Exploit

22 Dec 2025, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-22 22:16

Updated : 2025-12-27 17:15

NVD link : CVE-2023-53977

Mitre link : CVE-2023-53977

CVE.ORG link : CVE-2023-53977

JSON object : View

Products Affected

mybb

mybb

CWE

CWE-79

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

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