CVE-2025-67438 Sync-in Server has a stored cross-site scripting (XSS) vulnerability
An authenticated attacker can execute arbitrary JavaScript via crafted SVG uploads, leading to session cookie theft and sensitive data exposure.
- 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
What is CVE-2025-67438?
CVE-2025-67438 is a medium-severity cross-site scripting vulnerability in n/a, published on 20 Feb 2026. 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 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.
Weakness: CWE-79
Which versions are affected by CVE-2025-67438?
2 open source packages ship an affected version, including @sync-in/server. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
@sync-in/server npm | All versions | 1.9.3 |
@sync-in/server npm | All versions | 1.9.3 |
Products include Sync-in Sync-in Server.
How do I fix CVE-2025-67438?
Upgrade @sync-in/server to 1.9.3 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2025-67438 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-67438 exists.
Other vulnerabilities in n/a
Sources
Also known as GHSA-9jmq-xgjm-p8c2.