CVE-2026-87928 MaxSite CMS 0.94 through 109.6 HTML Upload XSS via admin_page
Logged-in users can upload malicious HTML files to MaxSite CMS, leading to persistent stored XSS attacks against visitors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-87928?
CVE-2026-87928 is a medium-severity cross-site scripting vulnerability in MaxSite CMS, published on 9 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
MaxSite CMS versions 0.94 through 109.6 contain a cross-site scripting vulnerability in the admin_page upload handler that allows any logged-in user to upload HTML files. Attackers can upload HTML containing malicious scripts to the uploads/_pages/ directory, which executes in visitors' browsers when the file is accessed, enabling persistent stored cross-site scripting attacks.
Weakness: CWE-434
Which versions are affected by CVE-2026-87928?
How do I fix CVE-2026-87928?
No fix has been published for CVE-2026-87928 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-2026-87928 being exploited?
There is no known exploitation of CVE-2026-87928 in the wild and no public exploit code.
Sources
Also known as GHSA-283m-m2f4-x73v.