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CVE-2019-18426

8.2, high Known exploited

WhatsApp Cross-Site Scripting Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.2, high high CVSS v3.1
EPSS, next 30 days
68% higher than 99.3% of scored CVEs
Exploitation
Confirmed in the wild
Published
21 Jan 20206 years ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 23 May 2022. US federal agencies had to remediate by 13 Jun 2022, a deadline that has passed.

Required action. Apply updates per vendor instructions.

Description

A vulnerability in WhatsApp Desktop versions prior to 0.3.9309 when paired with WhatsApp for iPhone versions prior to 2.20.10 allows cross-site scripting and local file reading. Exploiting the vulnerability requires the victim to click a link preview from a specially crafted text message.

Details

Vendor
Meta Platforms
Product
WhatsApp Desktop
Weakness
CWE-79 (opens in a new tab)
Status
Analyzed
Updated
17 Jun 2026
Assigner
cve-assign@fb.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

References 3

Exploit code 1

Advisories 1

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Meta Platforms CVEs

Every Meta Platforms CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2025-55177 Meta Platforms WhatsApp Incorrect Authorization Vulnerability KEV EPSS 5% 5.4, medium
  • CVE-2019-3568 WhatsApp VOIP Stack Buffer Overflow Vulnerability KEV EPSS 30% 9.8, critical

Beyond this page

Is CVE-2019-18426 in your network?

This page tells you how dangerous CVE-2019-18426 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2019-18426 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2019-18426 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.