CVE-2026-23863

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-01 · updated 2026-10-26
Weakness: CWE-158

Description

An attachment spoofing issue in WhatsApp for Windows prior to v2.3000.1032164386.258709 could have allowed maliciously formatted documents with embedded NUL bytes in the filename to be shown in the application as one type of file but run as an executable when opened. We have not seen evidence of exploitation in the wild.

Affected products

Facebook WhatsApp for Android: before 2.3000.1032164386.258709 — fixed in 2.3000.1032164386.258709

How to fix

Upgrade to a fixed version: Facebook WhatsApp for Android 2.3000.1032164386.258709. Check the vendor advisory for mitigations.

References

https://www.facebook.com/security/advisories/cve-2026-23863
https://www.whatsapp.com/security/advisories/2026

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