Headline
GHSA-vh3f-qppr-j97f: Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink
Summary
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.
Details
https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441
The createLink.openLink function takes base64 encoded links, decodes them, and then sets the resulting string as the src attribute of an iframe. It’s important to note that the protocol part is not validated, so a payload, which is a valid URL, such as javascript:alert(document.domain)//, can be provided to the function.
PoC
- Extract poc-mesh-web-sdk.zip
- Run
yarn installand thenyarn start - Paste this payload inside the input box:
amF2YXNjcmlwdDphbGVydCh3aW5kb3cucGFyZW50LmRvY3VtZW50LmJvZHkuZ2V0RWxlbWVudHNCeVRhZ05hbWUoImgyIikuaXRlbSgwKVsiaW5uZXJIVE1MIl0pLy8= - Click on the OpenLink button
- Notice the alert box and ability to access the
h2title from the parent page
It can also be verified via https://paylink.meshconnect.com/?linkToken=amF2YXNjcmlwdDphbGVydCgpLy8=.
Impact
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.
If access to the private key is possible or if transactions are tampered with or initialized, in a wallet context, it can result in a critical impact due to loss of funds scenarios.
Reporters
- GitHub Advisory Database
- GitHub Reviewed
- CVE-2025-59430
Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink
High severity GitHub Reviewed Published Sep 22, 2025 in FrontFin/mesh-web-sdk • Updated Sep 22, 2025
Package
npm @meshconnect/web-link-sdk (npm)
Affected versions
< 3.3.2
Summary
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.
Details
https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441
The createLink.openLink function takes base64 encoded links, decodes them, and then sets the resulting string as the src attribute of an iframe. It’s important to note that the protocol part is not validated, so a payload, which is a valid URL, such as javascript:alert(document.domain)//, can be provided to the function.
PoC
- Extract poc-mesh-web-sdk.zip
- Run yarn install and then yarn start
- Paste this payload inside the input box: amF2YXNjcmlwdDphbGVydCh3aW5kb3cucGFyZW50LmRvY3VtZW50LmJvZHkuZ2V0RWxlbWVudHNCeVRhZ05hbWUoImgyIikuaXRlbSgwKVsiaW5uZXJIVE1MIl0pLy8=
- Click on the OpenLink button
- Notice the alert box and ability to access the h2 title from the parent page
It can also be verified via https://paylink.meshconnect.com/?linkToken=amF2YXNjcmlwdDphbGVydCgpLy8=.
Impact
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.
If access to the private key is possible or if transactions are tampered with or initialized, in a wallet context, it can result in a critical impact due to loss of funds scenarios.
Reporters
- Amine zwxxb Elsassi of Aptos Labs
References
- GHSA-vh3f-qppr-j97f
- FrontFin/mesh-web-sdk@7f22148
- https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441
- https://nvd.nist.gov/vuln/detail/CVE-2025-59430
- FrontFin/mesh-web-sdk#124
Published to the GitHub Advisory Database
Sep 22, 2025
Last updated
Sep 22, 2025