CVE-2026-23863

nvd.nist.gov • June 6, 2026

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.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

WhatsApp Patches Medium Severity Flaws Affecting Windows Users Meta has disclosed and patched two medium severity security flaws in WhatsApp, affecting users on Windows, iPhone, and Android. The more critical vulnerability, CVE-2026-23863, allows malicious documents to appear harmless due to an attachment spoofing issue. This flaw affects WhatsApp for Windows versions prior to 2.3000.1032164386.258709, where a crafted filename can mislead users into executing malicious files. Although the vulnerabilities have been patched, users are urged to update their apps to the latest versions to mitigate risks. Malwarebytes reported that there is currently no evidence of exploitation in the wild, making this a maintenance update rather than an emergency. Users should enable automatic updates to ensure they receive future patches without manual checks. 2 sources 46

Extracted Entities

CVE-2026-23863

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Extracted Entities

Attack Types (1)

CVEs (1)

MITRE ATT&CK (1)

Platforms (1)