XSS in Sync-In Server
CVE-2025-67438
A Stored Cross-Site Scripting (XSS) vulnerability in Sync-in Server before 1.9.3 allows an authenticated attacker to execute arbitrary JavaScript in a victim's browser. By uploading a crafted SVG file containing a malicious payload, an attacker can access and exfiltrate sensitive information, including the user's session cookies.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
Weakness classification (CWE)
References
- github.com/Sync-in/server/releases/tag/v1.9.3 (Patch, Release Notes)
- gist.github.com/x0root/86db30af91bb0e1707eb7e57a049b6ad (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-67438?
- CVE-2025-67438 is a medium-severity vulnerability in Sync-In Server, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-02-20.
- How severe is CVE-2025-67438?
- Medium severity. CVSS v3 base score is 6.1 out of 10.