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Fencer Vulns
high 8.2

CVE-2019-18426 kev in the critical feed json

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-…

published 2020-01-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2019-8195

cvss
8.2
version 3.1, CNA
cisa kev
Exploited
added 2022-05-23
epss
67.9%
EPSS 67.9% chance of exploitation in 30 days, percentile 99.3%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • Facebook WhatsApp Desktop 0.3.9309

Timeline

  1. Published
  2. First public exploit (EDB-48295)
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-06-13 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
Meta Platforms, WhatsApp
CISA name
WhatsApp Cross-Site Scripting Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

67.86% chance of exploitation in the next 30 days, higher than 99.3% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-48295 WhatsApp Desktop 0.3.9308 - Persistent Cross-Site Scripting webapps, 2020-04-06
  • packetstormsecurity.com http://packetstormsecurity.com/files/157097/WhatsApp-Desktop-0.3.9308-Cross-Site-Scripting.html referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVD 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Affected products

  • Facebook WhatsApp Desktop

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.