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.
CVE-2025-57520
Score 6.1 from GitHub Security Advisory published 2025-09-10. NVD baseline CVSS 6.1; sources differ by 0.0.
- Lower severity and no public exploit yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.1
- EG Score
- 6.1(medium)
- EG Risk
- 43(Track)EG Risk 43/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity61% × 45%Exploitation40% × 40%Automatability0% × 15%Action: Routine — remediate on your standard cadence. - EPSS
- 21.9%
- KEV
- Not listed
Published
September 10, 2025
Last Modified
September 16, 2025
References (4)
- cve@mitrehttps://github.com/decaporg/decap-cms
- cve@mitrehttps://onurcangenc.com.tr/blog/decap-cms-xss-analysis
- cve@mitrehttps://onurcangenc.com.tr/posts/cve-2025-57520--stored-xss-in-decap-cms-3-8-3/
- 134c704f-9b21-4f2e-91b3-4a467353bcc0https://onurcangenc.com.tr/posts/cve-2025-57520--stored-xss-in-decap-cms-3-8-3/
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| npm | decap-cms | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(1 across 1 ecosystem)
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| decap-cms | — | — | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 12× in last 7d / 43× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-25 14:17 UTCEPSS rescore
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- 2026-05-29 23:02 UTCGHSA enrichment
- 2026-05-29 13:44 UTCEPSS rescore
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2025-57520?
When was CVE-2025-57520 disclosed?
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What is the CVSS score of CVE-2025-57520?
How do I remediate CVE-2025-57520?
Dependency Blast Radius
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