CVE-2019-18426 on CISA KEV

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

01What CISA says about this vulnerability

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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• www.facebook.com — https://www.facebook.com/security/advisories/cve-2019-18426
• packetstormsecurity.com — http://packetstormsecurity.com/files/157097/WhatsApp-Desktop-0.3.9308-Cross-Site…

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
Facebook	WhatsApp Desktop	0.3.9309, unspecified

06Detection

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection:

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