Vulnerability · Published Sep 22, 2025 · Assigned by GitHub_M

CVE-2025-59430Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink

High 8.2

In plain English

A high-severity cross-site scripting in mesh-web-sdk from FrontFin. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.2High

Exploit odds (30 days)0.4%top 62.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	@meshconnect/web-link-sdk	3.3.2	GHSA-vh3f-qppr-j97f

Affected products (as reported)

Vendor	Product	Versions
FrontFin	mesh-web-sdk	< 3.3.2

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N

References

https://github.com/FrontFin/mesh-web-sdk/security/advisories/GHSA-vh3f-qppr-j97f x_refsource_CONFIRM
https://github.com/FrontFin/mesh-web-sdk/pull/124 x_refsource_MISC
https://github.com/FrontFin/mesh-web-sdk/commit/7f22148516d58e21a8b7670dde927d614c0d15c2 x_refsource_MISC
https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441 x_refsource_MISC