EUVD-2026-25690Severity 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
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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 flaw has been found in MaxSite CMS up to 109.3. This vulnerability affects unknown code of the component down_count Plugin. This manipulation of the argument f_file/f_prefix causes cross site scripting. The attack may be initiated remotely. The exploit has been published and may be used. Upgrading to version 109.4 is able to resolve this issue. Patch name: 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. The affected component should be upgraded. 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 affects the down_count plugin, where unsanitized input in the f_file and f_prefix parameters allows authenticated high-privilege users to inject malicious scripts via remote network access with user interaction. The vendor classifies this as self-XSS due to high privilege requirements (PR:H) and user interaction (UI:P), but the lack of output encoding via htmlspecialchars() represents a secure coding violation. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the following concrete conditions: (1) Valid authentication credentials for a MaxSite CMS user account with high-privilege role, as indicated by CVSS PR:H; (2) Access to the down_count plugin component and ability to manipulate the f_file and f_prefix parameters; (3) User interaction (UI:P) from a victim (typically another administrator) who views the crafted output, such as navigating to or rendering a page displaying the poisoned plugin output; (4) A web browser without sufficient XSS protections (e.g., Content Security Policy headers are absent or permissive). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is constrained by multiple limiting factors despite a published exploit. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated administrator with high privileges in MaxSite CMS crafts a malicious URL containing JavaScript in the f_file or f_prefix parameter of the down_count plugin (e.g., f_file=<script>alert('XSS')</script>). The administrator either embeds this URL in a phishing email targeting other site administrators or uses it directly within the CMS to manipulate the display output. … |
| Remediation | Vendor-released patch: MaxSite CMS version 109.4. … Detailed patch versions, workarounds, and compensating controls in full report. |
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