EUVD-2026-25689Severity 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 security vulnerability has been detected in MaxSite CMS up to 109.3. Affected by this issue is some unknown functionality of the component mail_send Plugin. The manipulation of the argument f_subject/f_files/f_from leads to cross site scripting. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 109.4 can resolve this issue. The identifier of the patch is 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. It is advisable to upgrade the affected component. 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 mail_send plugin up to version 109.3 allows authenticated high-privilege users to inject malicious scripts via the f_subject, f_files, or f_from parameters, resulting in stored XSS that can affect other users. The vulnerability stems from missing input sanitization via htmlspecialchars() and is classified by the vendor as self-XSS. Publicly available exploit code exists, and a patch is available in version 109.4.
Technical ContextAI
The mail_send plugin in MaxSite CMS fails to properly sanitize user-supplied input in email form parameters before rendering them in HTML context. The vulnerability is rooted in CWE-79 (Improper Neutralization of Input During Web Page Generation), where untrusted data from the f_subject, f_files, and f_from parameters are reflected or stored without applying output encoding functions like htmlspecialchars(). The affected component processes email submissions but does not escape HTML special characters, allowing JavaScript payloads to execute in the browser context of subsequent users who view the affected data. The vendor's remediation explicitly applies htmlspecialchars() filtering to prevent incorrect data display and XSS payload execution.
RemediationAI
Upgrade MaxSite CMS to version 109.4 or later, which includes the patched mail_send plugin with htmlspecialchars() filtering applied to the f_subject, f_files, and f_from parameters. The patch is available at https://github.com/maxsite/cms/releases/tag/v109 and can be applied via the commit 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. For deployments unable to upgrade immediately, restrict administrative access to trusted personnel only, disable the mail_send plugin if not actively used, and implement Web Application Firewall (WAF) rules to block requests containing common XSS payloads in email form parameters. Additionally, audit existing email submission logs for evidence of injected scripts and purge affected data if detected. The primary mitigation (upgrade to 109.4) has no known side effects and is the recommended path forward.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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