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CVE-2025-57520

MediumPublished

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...

Published: Sep 10, 2025
Updated: Sep 11, 2025
Assigning CNA: mitre
Evidence observed: Aug 8, 2026

Primary CVSS

6.1/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 24.9%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2025-57520-Stored-XSS-in-Decap-CMS-3.8.3-PoC
A stored cross-site scripting (XSS) vulnerability exists in Decap CMS up to version 3.8.3. The issue affects multiple input fields in the **admin interface** and is triggered when a privileged user opens the **content preview panel** of a malicious entry.

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