CVE-2025-57520 Decap CMS Cross Site Scripting (XSS) vulnerability
Attackers can inject arbitrary JavaScript via unsanitized input fields in Decap CMS, executing code when users view the preview pane.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-57520?
CVE-2025-57520 is a medium-severity cross-site scripting vulnerability in n/a, published on 10 Sep 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A Cross Site Scripting (XSS) vulnerability exists in Decap CMS thru 3.8.3. Input fields such as body, tags, title, and description are not properly sanitized before being rendered in the content preview pane. This enables an attacker to inject arbitrary JavaScript which executes whenever a user views the preview panel. The vulnerability affects multiple input vectors and does not require user interaction beyond viewing the affected content.
Weakness: CWE-79
Which versions are affected by CVE-2025-57520?
2 open source packages ship an affected version, including decap-cms. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
decap-cms npm | All versions to 3.8.3 | None |
decap-cms npm | All versions to 3.8.3 | None |
Products include Techhub.p-M Decap Cms.
How do I fix CVE-2025-57520?
No fix has been published for CVE-2025-57520 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-2025-57520 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-57520 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-xp8g-32qh-mv28.