Medium

whatsapp-api-js fails to validate message's signature

  • Disclosed: 12.09.2024
  • Updated: 11.10.2026 10:22

Impact

Incorrect Access Control, anyone using the post or verifyRequestSignature methods to handle messages is impacted.

Patches

Patched in version 4.0.3.

Workarounds

It's possible to check the payload validation using the WhatsAppAPI.verifyRequestSignature and expect false when the signature is valid.

ts
function doPost(payload, header_signature) {
    if (whatsapp.verifyRequestSignature(payload.toString(), header_signature) {
        throw 403;
    }
    
    // Now the payload is correctly verified
    whatsapp.post(payload);
}

References

https://github.com/Secreto31126/whatsapp-api-js/pull/371

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package whatsapp-api-js >= 4.0.0, < 4.0.3 4.0.3

References

CVSS score 5.8/10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness (CWE)
CWE-347
Platform
npm
Package
whatsapp-api-js
Disclosed
12.09.2024
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-mwhf-vhr5-7j23 - CC BY 4.0

Vulnerability history: whatsapp-api-js

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

This is the only known vulnerability of this package.

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