CVE-2026-23863Network attack vector

Code execution via NUL-byte attachment spoofing

Published May 1, 2026 · Updated May 1, 2026

Attachment spoofing in WhatsApp for Windows before 2.3000.1032164386.258709 allows remote attackers to execute a disguised file. Attachment filename handling uses a NUL-truncated representation for the displayed type while permitting the executable file to run when opened. A recipient must receive and open the crafted document; the bounded consequence is attacker-controlled code execution, with no observed exploitation.

CVSS severity6.5
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Attachment spoofing in WhatsApp for Windows before 2.3000.1032164386.258709 allows remote attackers to execute a disguised file. Attachment filename handling uses a NUL-truncated representation for the displayed type while permitting the executable file to run when opened. A recipient must receive and open the crafted document; the bounded consequence is attacker-controlled code execution, with no observed exploitation.

The record

CVE
CVE-2026-23863
Published
May 1, 2026
Updated
May 1, 2026
Vendor
Meta Platforms, Inc.
Product
WhatsApp for Windows
Classifications
CWE-158, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.3000.*.252500 <2.3000.1032164386.258709

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Meta Platforms, Inc. · WhatsApp for Windowsversion=2.3000.*.252500 <2.3000.1032164386.258709

Published CVSS scores

6.5MetaCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-158Improper Neutralization of Null Byte or NUL Character
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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