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CVE-2023-53978

myBB Forums 1.8.26 Stored Cross-Site Scripting via Forum Announcements

Published: Dec 22, 2025Updated: Dec 27, 2025 Sources: CVE List NVDCWE-79
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 90.4%
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 announcement system that allows authenticated administrators to inject malicious scripts when creating announcements. Attackers can exploit this vulnerability by inserting script payloads in the announcement title field when adding announcements through the 'Forums and Posts' > 'Forum Announcements' interface, causing arbitrary JavaScript to execute when the announcement is displayed on the forum.

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

myBB forumsMybbWeb & CMS Plugins
mybbmybbWeb & 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://www.exploit-db.com/exploits/51136
exploit-db.com
https://mybb.com/
mybb.com
https://www.vulncheck.com/advisories/mybb-forums-stored-cross-site-scripting-via-forum-announcements
vulncheck.com

Timeline

Published
Dec 22, 2025
Last Updated
Dec 27, 2025

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