CVE-2026-7013: MaxSite CMS mail_send Plugin cross site scripting
A security vulnerability has been detected in MaxSite CMS up to 109.3. Affected by this issue is some unknown functionality of the component mailsend Plugin. The manipulation of the argument fsubject/ffiles/ffrom 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."
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
MaxSite CMS mail_send Pluginto a version that resolves this vulnerability.Fixed in 109.4 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7 - Configuration
Ensure the affected parameters f_subject/f_files/f_from are properly filtered/escaped using htmlspecialchars() to prevent cross-site scripting (the lack of filtering via htmlspecialchars() has already been fixed in the latest patch).
MaxSite CMS mail_send Plugin Input filtering = htmlspecialchars()
Event History
Frequently Asked Questions
What is the severity of CVE-2026-7013?
CVE-2026-7013 is categorized as a cross-site scripting vulnerability which can lead to significant security risks if exploited.
How do I fix CVE-2026-7013?
To fix CVE-2026-7013, update the MaxSite CMS to a version beyond 109.3 where the vulnerability has been addressed.
What components are affected by CVE-2026-7013?
CVE-2026-7013 affects the mail_send Plugin functionality in MaxSite CMS versions up to and including 109.3.
What kind of attack can CVE-2026-7013 facilitate?
CVE-2026-7013 can facilitate cross-site scripting attacks that may allow an attacker to execute arbitrary scripts in a victim's browser.
Who is impacted by CVE-2026-7013?
Users of MaxSite CMS versions up to 109.3 using the mail_send Plugin are at risk from the CVE-2026-7013 vulnerability.