CVE-2026-27147 GetSimple CMS: Stored Cross-Site Scripting (XSS) via SVG File Upload (Authenticated)

Medium 6.9 Published 20 Feb 2026 Updated 25 Feb 2026

Authenticated attackers can upload malicious SVG files to execute JavaScript in victim browsers via stored XSS in GetSimple CMS.

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-2026-27147?

CVE-2026-27147 is a medium-severity cross-site scripting vulnerability in GetSimpleCMS-CE, published on 20 Feb 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

GetSimple CMS is a content management system. All versions of GetSimple CMS are vulnerable to XSS through SVG file uploads. Authenticated users can upload SVG files via the administrative upload functionality, but they are not properly sanitized or restricted, allowing an attacker to embed malicious JavaScript. When the uploaded SVG file is accessed, the script executes in the browser. This issue does not have a fix at the time of publication.

Weakness: CWE-79

Which versions are affected by CVE-2026-27147?

It affects 1 product.

Products include Getsimple-Ce Getsimple Cms.

How do I fix CVE-2026-27147?

No fix has been published for CVE-2026-27147 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-2026-27147 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27147 exists.

Sources

Also known as GHSA-5gmq-hrcx-6w45.