MaxSite CMS up to 109.3 Antispam Plugin /admin/plugin_antispam f_logging_file cross site scripting

Summaryinfo

A vulnerability, which was classified as problematic, has been found in MaxSite CMS up to 109.3. Affected by this issue is some unknown functionality of the file /admin/plugin_antispam of the component Antispam Plugin. The manipulation of the argument f_logging_file leads to cross site scripting. This vulnerability is documented as CVE-2026-7011. The attack can be initiated remotely. Additionally, an exploit exists. 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."

Detailsinfo

A vulnerability was found in MaxSite CMS up to 109.3 and classified as problematic. This issue affects an unknown functionality of the file /admin/plugin_antispam of the component Antispam Plugin. The manipulation of the argument f_logging_file with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-7011. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation needs additional levels of successful authentication. It demands that the victim is doing some kind of user interaction. Technical details as well as a public exploit are known. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The exploit is available at github.com. It is declared as proof-of-concept. 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."

Upgrading to version 109.4 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at CNNVD (CNNVD-202604-5137). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.4
VulDB Meta Temp Score: 2.2

VulDB Base Score: 2.4
VulDB Temp Score: 2.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CMS 109.4
Patch: 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7

Timelineinfo

04/25/2026 Advisory disclosed
04/25/2026 +0 days VulDB entry created
04/27/2026 +2 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-7011 (🔒)
GCVE (CVE): GCVE-0-2026-7011
GCVE (VulDB): GCVE-100-359591
CNNVD: CNNVD-202604-5137 - MaxSite CMS 跨站脚本漏洞

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/25/2026 12:19
Updated: 04/27/2026 23:21
Changes: 04/25/2026 12:19 (63), 04/27/2026 23:21 (6)
Complete: 🔍
Submitter: konchan
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #796736: MaxSite CMS CMS 109.3 Cross Site Scripting (by konchan)

Be aware that VulDB is the high quality source for vulnerability data.

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