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. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the following specific conditions: (1) Network access to a MaxSite CMS instance running version 109.3 or earlier with the mail_send plugin enabled (default state); (2) Valid authentication credentials with high-privilege level (administrator or equivalent role); (3) User interaction from a victim who views the email submission or form data containing the injected payload, as indicated by UI:P in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Despite the 4.8 CVSS score, real-world risk is constrained by multiple factors. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An authenticated administrator with high privileges (or a user who has compromised an admin account) submits an email via the mail_send plugin with a crafted XSS payload in the f_subject field, such as '<img src=x onerror=alert(1)>'. The payload is stored without sanitization. … |
| Remediation | 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. … Detailed patch versions, workarounds, and compensating controls in full report. |
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