CVE DATABASE / CVE-2019-18426
CVE-2019-18426
WhatsApp Cross-Site Scripting Vulnerability
CVSS 8.2 · HIGH
⚠ CISA KEV — ACTIVELY EXPLOITED
On the CISA KEV catalog
Confirmed exploited in the wild. Added 2022-05-23.
Federal remediation due 2022-06-13.
Required action: Apply updates per vendor instructions.
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.
CVSS 3.1 breakdown
| Base score | 8.2 (HIGH) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N |
| Attack vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | REQUIRED |
| Scope | CHANGED |
| Confidentiality | HIGH |
| Integrity | LOW |
| Availability | NONE |
Weakness type (CWE)
Affected products
Whatsapp whatsapp
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References
- http://packetstormsecurity.com/files/157097/WhatsApp-Desktop-0.3.9308-Cross-Site-Scripting.html
- https://www.facebook.com/security/advisories/cve-2019-18426
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-18426
Data: NIST NVD + CISA KEV. NVD last modified 2025-10-24. Always verify against the vendor advisory before acting.