CVE-2026-70650 Cross-site scripting in GetSimpleCMS-CE
Authenticated attackers can inject malicious scripts into page metadata that execute in administrators' browsers when viewing backups, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-70650?
CVE-2026-70650 is a high-severity cross-site scripting vulnerability in GetSimpleCMS-CE, published on 1 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
GetSimple CMS is a content management system (CMS), and GetSimple CMS CE is the community edition of that CMS. In versions 3.3.22 and prior, an authenticated stored Cross-Site Scripting (XSS) vulnerability exists in the page backup viewer (admin/backup-edit.php). Page fields are correctly HTML-encoded when a page is saved, but the backup viewer decodes them again (htmldecode() / strip_decode()) and prints the result without re-escaping. A user who can edit a page can store JavaScript in a page's Keywords, Description, Menu text or Content; it executes in the browser of any administrator who later views that page's backup, in the context of the admin control panel. At time of publication, there are no publicly available patches.
Weakness: CWE-79
Which versions are affected by CVE-2026-70650?
How do I fix CVE-2026-70650?
No fix has been published for CVE-2026-70650 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-2026-70650 being exploited?
There is no known exploitation of CVE-2026-70650 in the wild and no public exploit code.
Sources
Also known as GHSA-p6vf-2xr7-mcf4.