Is CVE-2026-23863 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-23863 being exploited in the wild.

How severe is CVE-2026-23863?

Medium severity, with a CVSS score of 6.5, published 1 May 2026.

Which products and versions are affected?

Meta WhatsApp for Windows prior to v2.3000.1032164386.258709.

Is there a fix for CVE-2026-23863?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-23863 attacked?

It is attacked over the network, in a network appliance.

Am I affected by CVE-2026-23863?

Check whether you run Meta WhatsApp for Windows at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-23863: Meta WhatsApp attachment spoofing in Windows Desktop client

CVE-2026-23863 · Severity: medium · CVSS 6.5 · Published 2026-05-01

A security flaw in the WhatsApp application for Windows could allow attackers to trick users into running malicious software. By sending a specially crafted file, an attacker can make a dangerous executable program appear as a harmless document (like a PDF or image) within the chat interface. If a user is deceived into opening the file, the malicious code would run on their computer, potentially compromising their system.

Vendors: Meta.

Quick answers

Is CVE-2026-23863 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-23863 being exploited in the wild.
How severe is CVE-2026-23863?: Medium severity, with a CVSS score of 6.5, published 1 May 2026.
Which products and versions are affected?: Meta WhatsApp for Windows prior to v2.3000.1032164386.258709.
Is there a fix for CVE-2026-23863?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-23863 attacked?: It is attacked over the network, in a network appliance.
Am I affected by CVE-2026-23863?: Check whether you run Meta WhatsApp for Windows at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An attachment spoofing vulnerability exists in WhatsApp for Windows due to improper neutralization of NUL bytes (CWE-158) in filenames. By embedding NUL bytes in a file's name, an attacker can cause the WhatsApp UI to display a benign file extension while the underlying operating system executes the file based on its true extension (e.g., .exe). This requires user interaction to open the received attachment. The vulnerability is addressed in version 2.3000.1032164386.258709 and later.

Affected products

Meta WhatsApp for Windows prior to v2.3000.1032164386.258709

Timeline

2026-05-01: disclosed
2026-05-01: advisory

References

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