CVE-2025-59430
Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink
Impact
### 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 1. Extract [poc-mesh-web-sdk.zip](https://github.com/user-attachments/files/22223079/poc-mesh-web-sdk.zip) 2. Run `yarn install` and then `yarn start` 3. Paste this payload inside the input box: `amF2YXNjcmlwdDphbGVydCh3aW5kb3cucGFyZW50LmRvY3VtZW50LmJvZHkuZ2V0RWxlbWVudHNCeVRhZ05hbWUoImgyIikuaXRlbSgwKVsiaW5uZXJIVE1MIl0pLy8=` 4. Click on the _OpenLink_ button 5. 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](https://github.com/zwxxb) of [Aptos Labs](https://aptoslabs.com/)
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | @meshconnect/web-link-sdk | < 3.3.2 | 3.3.2 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441
- https://github.com/FrontFin/mesh-web-sdk/commit/7f22148516d58e21a8b7670dde927d614c0d15c2
- https://github.com/FrontFin/mesh-web-sdk/pull/124
- https://github.com/FrontFin/mesh-web-sdk/security/advisories/GHSA-vh3f-qppr-j97f
- https://github.com/advisories/GHSA-vh3f-qppr-j97f
- https://nvd.nist.gov/vuln/detail/CVE-2025-59430