EUVD-2026-25691Severity 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 vulnerability has been found in MaxSite CMS up to 109.3. This issue affects some unknown processing of the component Guestbook Plugin. Such manipulation of the argument f_text/f_slug/f_limit/f_email leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 109.4 is capable of addressing this issue. The name of the patch is 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. It is suggested 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 Guestbook Plugin up to version 109.3 allows authenticated high-privilege users to inject malicious scripts via the f_text, f_slug, f_limit, or f_email parameters due to missing htmlspecialchars() output filtering. The vulnerability requires high-privilege authentication and user interaction (UI:P), limiting it to trusted administrators, but publicly available exploit code exists. Upgrading to version 109.4 resolves the issue by implementing proper output encoding.
Technical ContextAI
The Guestbook Plugin component in MaxSite CMS fails to properly sanitize user-supplied input before rendering it in HTML output. The root cause (CWE-79: Improper Neutralization of Input During Web Page Generation) stems from the absence of htmlspecialchars() or equivalent output encoding on the f_text, f_slug, f_limit, and f_email parameters. This allows script injection when these parameters are displayed. The vendor's security analysis classifies this as 'Self-XSS' because exploitation requires high administrative privileges (PR:H in CVSS 4.0), which significantly constrains real-world impact despite the network-accessible attack vector (AV:N). The CPE cpe:2.3:a:maxsite:cms:*:*:*:*:*:*:*:* indicates all product lines are affected up to version 109.3.
RemediationAI
Upgrade MaxSite CMS to version 109.4 or later, which includes the security patch commit 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 implementing htmlspecialchars() output encoding on the affected parameters (f_text, f_slug, f_limit, f_email) in the Guestbook Plugin. Patch availability is confirmed via the upstream GitHub repository (https://github.com/maxsite/cms). If immediate upgrade is not feasible, restrict Guestbook Plugin access to trusted administrators only by disabling the plugin or using file permissions / web server access controls to limit who can submit guestbook entries; however, this does not eliminate the XSS risk if high-privilege users are compromised. The vendor's fix is sufficient and no additional compensating controls beyond patching are necessary post-upgrade.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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