CVE-2026-7015 MaxSite CMS Guestbook Plugin cross site scripting
Remote attackers can inject malicious scripts via Guestbook plugin inputs, potentially executing code in victim browsers.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-7015?
CVE-2026-7015 is a medium-severity cross-site scripting vulnerability in MaxSite CMS, published on 26 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A vulnerability has been found in MaxSite CMS up to 109.3. This issue affects some unknown processing of the component Guestbook Plugin. Such manipulation of the argument f_text/f_slug/f_limit/f_email leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 109.4 is capable of addressing this issue. The name of the patch is 8a3946bd0a54bfb72a4d57179fcd253f2c550cd7. It is suggested 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."
Which versions are affected by CVE-2026-7015?
How do I fix CVE-2026-7015?
No fix has been published for CVE-2026-7015 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-7015 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-7015 exists.
Sources
Also known as GHSA-28c9-8fx6-5h79.