CVE-2025-66492 Masa CMS vulnerable to Cross-Site Scripting (XSS) through URL Parameter
Attacker can execute arbitrary scripts via unsanitized URL parameter, leading to session hijacking and data theft in Masa CMS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-66492?
CVE-2025-66492 is a high-severity cross-site scripting vulnerability in MasaCMS, published on 12 Dec 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
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.
Weakness: CWE-79
Which versions are affected by CVE-2025-66492?
It affects 1 product.
Products include Masacms Masacms.
How do I fix CVE-2025-66492?
No fix has been published for CVE-2025-66492 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-66492 being exploited?
There is no known exploitation of CVE-2025-66492 in the wild and no public exploit code.
Other vulnerabilities in MasaCMS
Sources
Also known as GHSA-249c-vqwv-43vc.