CVE-2025-59430: @meshconnect/web link sdk Mesh Connect JS SDK Vulnerable Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vh3f-qppr-j97f",
  "modified" : "2025-09-22T21:58:19Z",
  "published" : "2025-09-22T21:09:27Z",
  "aliases" : [ "CVE-2025-59430" ],
  "summary" : "Mesh Connect JS SDK Vulnerable to Cross Site Scripting via createLink.openLink",
  "details" : "### Summary\nThe 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.\n### Details\nhttps://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441\nThe `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.\n\n### PoC\n1. Extract [poc-mesh-web-sdk.zip](https://github.com/user-attachments/files/22223079/poc-mesh-web-sdk.zip)\n2. Run `yarn install` and then `yarn start`\n3. Paste this payload inside the input box: `amF2YXNjcmlwdDphbGVydCh3aW5kb3cucGFyZW50LmRvY3VtZW50LmJvZHkuZ2V0RWxlbWVudHNCeVRhZ05hbWUoImgyIikuaXRlbSgwKVsiaW5uZXJIVE1MIl0pLy8=` \n4. Click on the _OpenLink_ button\n5. Notice the alert box and ability to access the `h2` title from the parent page\n\nIt can also be verified via `https://paylink.meshconnect.com/?linkToken=amF2YXNjcmlwdDphbGVydCgpLy8=`.\n\n### Impact\nThis 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.\n\nIf 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.\n\n### Reporters\n- [Amine `zwxxb` Elsassi](https://github.com/zwxxb) of [Aptos Labs](https://aptoslabs.com/)",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "@meshconnect/web-link-sdk"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "3.3.2"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/FrontFin/mesh-web-sdk/security/advisories/GHSA-vh3f-qppr-j97f"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2025-59430"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FrontFin/mesh-web-sdk/pull/124"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FrontFin/mesh-web-sdk/commit/7f22148516d58e21a8b7670dde927d614c0d15c2"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/FrontFin/mesh-web-sdk"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/FrontFin/mesh-web-sdk/blob/cf013b85ab95d64c63cbe46d6cb14695474924e7/packages/link/src/Link.ts#L441"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-79" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-09-22T21:09:27Z",
    "nvd_published_at" : "2025-09-22T19:16:23Z"
  }
}