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ExploitedIn CISA KEVFix available

CVE-2019-18426

Exploitation confirmed. First attested on 2022-05-23 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-01-21
  • Fixed in2.20.10 · 0.3.9309
  • WeaknessCWE-79

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-01-2121:15CVE publishedNVD
  2. 2020-04-06Exploit-DB entryExploit-DB
  3. 2022-05-23Added to the CISA KEV catalogCISA KEV
  4. 2022-05-23Listed as exploited by GCVEGCVE
  5. 2022-05-23Exploitation first reportedCISA KEV
  6. 2025-02-0712:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-18426?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-18426?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Whatsapp
BranchAffectedFixed in
2.20< 2.20.102.20.10
0.3< 0.3.93090.3.9309

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As facebook, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Facebook WhatsApp Desktop
    Affected
    • = 0.3.9309no fix stated
    • < 0.3.9309fixed in 0.3.9309custom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-04-06

Fix

  1. Update Whatsapp to 2.20.10 · 0.3.9309
  2. CISA’s required action: Apply updates per vendor instructions.due 2022-06-13

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-48295
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedHumanSecurity/CVE-2019-18426
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-05-23
Patch Due Date
2022-06-13
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
Published
2020-01-21
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-x67c-8vp2-26mr

Frequently asked questions

What is CVE-2019-18426?

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.

Is CVE-2019-18426 actively exploited?

Yes. CVE-2019-18426 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-06-13.

What is the CVSS score for CVE-2019-18426?

CVE-2019-18426 has a CVSS v3 base score of 8.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N.

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Sources for this record