CVE-2025-51489 MoonShine Arbitrary File Upload Vulnerability
Remote attackers can execute arbitrary JavaScript via malicious SVG uploads in MoonShine, potentially compromising user sessions.
- 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
- Available
What is CVE-2025-51489?
CVE-2025-51489 is a medium-severity cross-site scripting vulnerability in n/a, published on 19 Aug 2025. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
A Stored Cross-Site Scripting (XSS) vulnerability exists in MoonShine version < 3.12.5, allowing remote attackers to upload a malicious SVG file when creating/updating an Article and correctly execute arbitrary JavaScript when the file link is opened.
Which versions are affected by CVE-2025-51489?
2 open source packages ship an affected version, including moonshine/moonshine. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
moonshine/moonshine Packagist | All versions | 3.12.5 |
moonshine/moonshine Packagist | All versions | 3.12.5 |
Products include Moonshine Moonshine.
How do I fix CVE-2025-51489?
Upgrade moonshine/moonshine to 3.12.5 or later.
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-2025-51489 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-51489 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-8xfq-7f6m-mpmf.