CVE-2025-66492
December 12, 2025
Masa CMS is an open source Enterprise Content Management platform. Versions 7.2.8 and below, 7.3.1 through 7.3.13, 7.4.0-alpha.1 through 7.4.8 and 7.5.0 through 7.5.1 are vulnerable to XSS when an unsanitized value of the ajax URL query parameter is directly included within the <head> section of the HTML page. An attacker can execute arbitrary scripts in the context of the user's session, potentially leading to Session Hijacking, Data Theft, Defacement and Malware Distribution. This issue is fixed in versions 7.5.2, 7.4.9, 7.3.14, and 7.2.9. To work around this issue, configure a Web Application Firewall (WAF) rule (e.g., ModSecurity) to block requests containing common XSS payload characters in the ajax query parameter. Alternatively, implement server-side sanitization using middleware to strip or escape dangerous characters from the ajax parameter before it reaches the vulnerable rendering logic.
Affected Packages
https://github.com/MasaCMS/MasaCMS.git (GITHUB):
Affected version(s) >=5.5 <7.2.9Fix Suggestion:
Update to version 7.2.9https://github.com/MasaCMS/MasaCMS.git (GITHUB):
Affected version(s) >=7.5.0 <7.5.2Fix Suggestion:
Update to version 7.5.2https://github.com/MasaCMS/MasaCMS.git (GITHUB):
Affected version(s) >=7.3 <7.3.14Fix Suggestion:
Update to version 7.3.14https://github.com/MasaCMS/MasaCMS.git (GITHUB):
Affected version(s) >=7.4.0 <7.4.9Fix Suggestion:
Update to version 7.4.9Related Resources (2)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.4
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
PASSIVE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
LOW
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
EPSS
Base Score:
0.06
