CVE-2019-18426
Published: May 23, 2022
Official Description
A vulnerability in WhatsApp Desktop when paired with WhatsApp for iPhone allows cross-site scripting and local file reading.
CISA KEV Advisory
WhatsApp Cross-Site Scripting Vulnerability
A vulnerability in WhatsApp Desktop when paired with WhatsApp for iPhone allows cross-site scripting and local file reading.
Apply updates per vendor instructions.
Risk Analysis
This vulnerability in WhatsApp Desktop, when paired with WhatsApp for iPhone, allows for cross-site scripting and local file reading, potentially exposing sensitive user data. Its inclusion in the KEV catalog and a high EPSS score indicate a significant and confirmed risk of exploitation.
This vulnerability is actively being exploited in the wild and is listed in CISA's KEV catalog, confirming its real-world exploitation.
Ensure WhatsApp Desktop and WhatsApp for iPhone are updated to the latest versions. Users should be cautious about opening suspicious links or files received through WhatsApp.
Technical Analysis
CVE-2019-18426 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2019-18426 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
All References (1)
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2019-18426 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1