CVE-2025-59430 Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink
Attackers can execute arbitrary JavaScript in the parent page context via unsanitized URLs in the Mesh Connect JS SDK, accessing sensitive data.
- 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-2025-59430?
CVE-2025-59430 is a high-severity cross-site scripting vulnerability in FrontFin mesh-web-sdk, published on 22 Sep 2025. 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
Mesh Connect JS SDK contains JS libraries for integrating with Mesh Connect. Prior to version 3.3.2, the lack of sanitization of URLs protocols in the createLink.openLink function enables the execution of arbitrary JavaScript code within the context of the parent page. This is technically indistinguishable from a real page at the rendering level and allows access to the parent page DOM, storage, session, and cookies. If the attacker can specify customIframeId, they can hijack the source of existing iframes. This issue has been patched in version 3.3.2.
Weakness: CWE-79
Which versions are affected by CVE-2025-59430?
2 open source packages ship an affected version, including @meshconnect/web-link-sdk.
| Package | Affected | Fixed in |
|---|---|---|
@meshconnect/web-link-sdk npm | All versions | 3.3.2 |
@meshconnect/web-link-sdk npm | All versions | 3.3.2 |
How do I fix CVE-2025-59430?
Upgrade @meshconnect/web-link-sdk to 3.3.2 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-2025-59430 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-59430 exists.
Sources
Also known as GHSA-vh3f-qppr-j97f.