# 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.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N`)
- **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 available:** No
- **Published:** 10 Sep 2025
- **Updated:** 11 Sep 2025
- **Also known as:** GHSA-xp8g-32qh-mv28

## 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 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-57520?

2 open source packages ship an affected version, including decap-cms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `decap-cms` | npm | All versions to 3.8.3 | None |
| `decap-cms` | npm | All versions to 3.8.3 | None |

Products: 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.

## 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:

- 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. (github_poc): https://github.com/onurcangnc/CVE-2025-57520-Stored-XSS-in-Decap-CMS-3.8.3-

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-57520 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-57520 exists.

Affected packages and fixed versions:
- decap-cms (npm): affected all versions up to 3.8.3; no fix listed
- decap-cms (npm): affected all versions up to 3.8.3; no fix listed

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-57520/ (Markdown: https://insights.sbomify.com/CVE-2025-57520/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-57520
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-57520
- OSV: https://osv.dev/vulnerability/CVE-2025-57520

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From sbomify Insights: https://insights.sbomify.com/CVE-2025-57520/
Summaries are generated and may contain mistakes; the official description above is the record.