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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."

PUBLISHED Reserved 2026-04-25 | Published 2026-04-26 | Updated 2026-04-27 | Assigner VulDB




MEDIUM: 4.8CVSS: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
LOW: 2.4CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
LOW: 2.4CVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C
3.3AV:N/AC:L/Au:M/C:N/I:P/A:N/E:POC/RL:OF/RC:C

Problem types

Cross Site Scripting

Code Injection

Product status

109.0
affected

109.1
affected

109.2
affected

109.3
affected

109.4
unaffected

Timeline

2026-04-25:Advisory disclosed
2026-04-25:VulDB entry created
2026-04-25:VulDB entry last update

Credits

konchan (VulDB User) reporter

VulDB CNA Team coordinator

References

vuldb.com/vuln/359591 (VDB-359591 | MaxSite CMS Antispam Plugin plugin_antispam cross site scripting) vdb-entry technical-description

vuldb.com/vuln/359591/cti (VDB-359591 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/submit/796736 (Submit #796736 | MaxSite CMS CMS 109.3 Cross Site Scripting) third-party-advisory

github.com/... Stored XSS-in-antispam-plugin-maxsite-cms.pdf exploit

github.com/...ommit/8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 patch

github.com/maxsite/cms/releases/tag/v109 patch

github.com/maxsite/cms/ product

cve.org (CVE-2026-7011)

nvd.nist.gov (CVE-2026-7011)

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