CVE-2026-7011 Details
Description
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."
A cross-site scripting (XSS) vulnerability has been identified in the Antispam Plugin of MaxSite CMS, affecting versions prior to 109.4. The issue arises in the file '/admin/plugin_antispam', where the 'f_logging_file' parameter is not properly sanitized, allowing attackers to inject malicious scripts. This vulnerability can be exploited remotely and is classified as a stored XSS, meaning the injected script is saved and can affect multiple users. The vulnerability has been publicly disclosed and exploited.
Users are advised to upgrade to MaxSite CMS version 109.4 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Apr 26, 2026CISA-ADP
Assessed Apr 27, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/maxsite/cms/ | [email protected] | Source CodeVendor |
| https://github.com/maxsite/cms/commit/8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 | [email protected] | Source CodeVendor |
| https://github.com/maxsite/cms/releases/tag/v109 | [email protected] | Release NotesVendor |
| https://github.com/wnaspy/CVE/blob/main/Report-%20Stored%20XSS-in-antispam-plugin-maxsite-cms.pdf | [email protected] | Partial Content |
| https://vuldb.com/submit/796736 | [email protected] | Technical Description |
| https://vuldb.com/vuln/359591 | [email protected] | AdvisoryExploitRemedy |
| https://vuldb.com/vuln/359591/cti | [email protected] | Content Wall |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
| CWE-94 | Improper Control of Generation of Code ('Code Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| MaxSite CMS | <= 109.3 |
CPE
Remediation
| |
| MaxSite Antispam Plugin | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Apr 26, 2026 | New CVE Received | [email protected] |