# CVE-2025-67438: Sync-in Server stored cross-site scripting in SVG file upload

Source: https://junglewise.ai/threats/cve-2025-67438-sync-in-server-stored-cross-site-scripting-in-svg-file-upload  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-20. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2025-67438 · Severity: medium · CVSS 4 · Published 2026-02-20

Sync-in Server is a collaborative file management platform that allows users to upload and share documents. An authenticated attacker can upload a malicious SVG file that executes arbitrary JavaScript in other users' browsers when they view it, potentially stealing session cookies and sensitive information. This vulnerability requires user authentication and victim interaction to trigger.

Technologies: [@sync-in/server (npm)](https://junglewise.ai/threats/technologies/sync-in-server). Vendors: [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2025-67438 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-67438 being exploited in the wild.

**How severe is CVE-2025-67438?** Medium severity, with a CVSS score of 4, published 20 February 2026.

**Which products and versions are affected?** @sync-in/server (npm) SEMVER:introduced=0,fixed=1.9.3.

**Is there a fix for CVE-2025-67438?** Yes. @sync-in/server (npm): upgrade to 1.9.3 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2025-67438 attacked?** It is attacked over the network.

**Am I affected by CVE-2025-67438?** Check whether you run @sync-in/server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- @sync-in/server (npm): upgrade to 1.9.3 or later

  ```sh
  npm install @sync-in/server@1.9.3
  ```


## Technical details

This is a stored cross-site scripting (CWE-79) vulnerability in Sync-in Server prior to version 1.9.3. An authenticated attacker can upload a crafted SVG file containing embedded malicious JavaScript. When other users access or preview the SVG file, the browser executes the injected script in their security context, allowing session hijacking and data theft. The root cause was improper file content-type handling; the fix involves serving uploaded files with the `Content-Disposition: attachment` header to force download behavior instead of in-browser rendering. Authentication is required, but no special privileges are needed beyond user login status.

## Affected products

- Sync-in Server before 1.9.3

## Identifiers

- CVE-2025-67438
- GHSA-9jmq-xgjm-p8c2

## Timeline

- 2026-02-20: disclosed
- 2025-12-07: patched: Fix committed on December 7, 2025; patched in version 1.9.3

## References

- [https://github.com/Sync-in/server/commit/a6276d067725637310e4e83a3eee337aae81f439](https://github.com/Sync-in/server/commit/a6276d067725637310e4e83a3eee337aae81f439)

## Related threats

- [Sync-in Server has Username/Login Enumeration via Timing Side-Channel on POST /api/auth/login (incomplete fix of the prior timing-attack advisory)](https://junglewise.ai/threats/cve-2026-58272-sync-in-server-username-enumeration-via-timing-side-channel-in)
- [Sync-in Server ReDoS via unsanitized regex in pathFilters](https://junglewise.ai/threats/cve-2026-58270-sync-in-server-redos-via-unsanitized-regex-in-pathfilters)
- [@sync-in/server vulnerable to TOTP Brute-Force via `POST /api/app/sync/register`](https://junglewise.ai/threats/cve-2026-58271-sync-in-server-totp-brute-force-in-sync-registration)
- [Sync-in Server two-factor authentication bypass in token endpoint](https://junglewise.ai/threats/cve-2026-58269-sync-in-server-two-factor-authentication-bypass-in-token-endpoint)
- [Sync-in Server SSRF bypass via IPv4-mapped IPv6 addresses](https://junglewise.ai/threats/cve-2026-47684-sync-in-server-ssrf-bypass-via-ipv4-mapped-ipv6-addresses)