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CVE-2019-18426

WhatsApp Cross-Site Scripting

8.2 HIGHActively exploited (CISA KEV)Public exploitEPSS 67.9%
  1. Published21 Jan 2020
  2. Added to CISA KEV23 May 2022
  3. Remediation due13 Jun 2022
Actively exploited (CISA KEV)

A vulnerability in WhatsApp Desktop when paired with WhatsApp for iPhone allows cross-site scripting and local file reading.

Added to KEV: 23 May 2022Federal remediation due: 13 Jun 2022

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeChanged
ConfidentialityHigh
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Affected products

Whatsapp< 0.3.9309 · < 2.20.10

Remediation

Fixed in
Whatsapp≥ 0.3.9309

References

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Frequently asked

Is CVE-2019-18426 being actively exploited?

Yes. CVE-2019-18426 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 23 May 2022.

How severe is CVE-2019-18426?

CVE-2019-18426 has a CVSS 3.1 base score of 8.2, rated high. EPSS estimates a 67.9% probability of exploitation.

Which products are affected by CVE-2019-18426?

Affected products include Whatsapp.

How do I fix CVE-2019-18426?

Upgrade affected software to a fixed version, for example Whatsapp 0.3.9309 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2019-18426 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.