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CVE-2023-53977

myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Management

Published: Dec 22, 2025Updated: Dec 27, 2025 Sources: CVE List NVDCWE-79
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 90.9%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
No Fix Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:RS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

mybbmybbWeb & CMS Plugins
myBB forumsMybbWeb & CMS Plugins
mybboss-projectWeb & CMS Pluginsaka mybb forums

Attack Graph

Products CVE Techniques Tactics

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Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

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MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://mybb.com/
mybb.com
https://www.exploit-db.com/exploits/51136
exploit-db.com
https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-management
vulncheck.com

Timeline

Published
Dec 22, 2025
Last Updated
Dec 27, 2025

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