CVE-2025-57520 json
Decap CMS Cross Site Scripting (XSS) vulnerability
published last yr. modified 4mo ago also GHSA-xp8g-32qh-mv28 , EUVD-2025-27594
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
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.
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Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- last yr.
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-09).
Exploits and checks
- onurcangenc.com.tr https://onurcangenc.com.tr/posts/cve-2025-57520--stored-xss-in-decap-cms-3-8-3/ referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| GitHub | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | decap-cms | <=3.8.3 |
no fix listed |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
onurcangenc.com.tr
/posts/cve-2025-57520--stored-xss-in-decap-cms-3-8-3/
exploit, third-party-advisory
-
onurcangenc.com.tr
/blog/decap-cms-xss-analysis
broken-link
-
github.com
/decaporg/decap-cms
package, product
-
nvd.nist.gov
/vuln/detail/CVE-2025-57520
advisory
-
onurcangenc.com.tr
/posts/cve-2025-57520--stored-xss-in-decap-cms-3-8-3
web
Sources
- CVE List CVE-2025-57520
- GitHub Advisory GHSA-xp8g-32qh-mv28
- NVD CVE-2025-57520
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