EUVD-2026-25685Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
10DescriptionCVE.org
A weakness has been identified in MaxSite CMS up to 109.3. Affected by this vulnerability is an unknown functionality of the file /admin/plugin_antispam of the component Antispam Plugin. Executing a manipulation of the argument f_logging_file can lead to cross site scripting. It is possible to launch the attack remotely. The exploit has been made available to the public and could be used for attacks. Upgrading to version 109.4 addresses this issue. This patch is called 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. Upgrading the affected component is advised. The vendor was informed early about this issue. They classify it as a "Self-XSS". They deployed a countermeasure: "Nevertheless, we consider this a violation of secure coding standards. The lack of filtering via htmlspecialchars() has already been fixed in the latest patch to prevent incorrect data display."
AnalysisAI
Cross-site scripting (XSS) in MaxSite CMS up to version 109.3 allows authenticated administrators to inject malicious scripts via the f_logging_file parameter in the Antispam Plugin admin interface, leading to stored XSS with user interaction required. The vulnerability affects the /admin/plugin_antispam endpoint and results from insufficient output encoding. Vendor-released patch version 109.4 addresses the issue by implementing htmlspecialchars() filtering; publicly available exploit code exists.
Technical ContextAI
The vulnerability exists in the Antispam Plugin component of MaxSite CMS, specifically within the /admin/plugin_antispam endpoint. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), stemming from a lack of output encoding on user-supplied data in the f_logging_file parameter. The vendor's analysis confirms that the htmlspecialchars() function was missing from the output rendering logic, allowing attacker-controlled input to be directly reflected in HTML context without sanitization. This is a stored XSS variant since the payload is persisted in the logging file configuration. The attack surface is limited to authenticated administrative users, reducing the practical exploitation scope compared to unauthenticated XSS vulnerabilities.
RemediationAI
Upgrade MaxSite CMS to version 109.4 or later, which implements htmlspecialchars() output encoding on the f_logging_file parameter as confirmed by vendor patch 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. For organizations unable to upgrade immediately, restrict administrative access to the /admin/plugin_antispam endpoint to trusted internal networks only using web server ACLs or reverse proxy rules, reducing the attack surface by preventing unauthorized admin access attempts. Additionally, implement Content Security Policy (CSP) headers with script-src directives set to 'self' on the admin interface to mitigate stored XSS payload execution, though this does not address the root cause. Monitor admin account activity and logging file modifications for signs of unauthorized configuration changes. The vendor's fix specifically adds input filtering to prevent incorrect data display, so upgrading is the definitive remediation with no known side effects.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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