CVE-2026-23863 PUBLISHED

Assigner: Meta
Reserved: 16.01.2026 Published: 01.05.2026 Updated: 01.05.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:F/RL:O/RC:C
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	High
User Interaction	Required	Availability Impact	None

CVSS 3.1

Product Status

Vendor	Facebook
Product	WhatsApp Desktop for Windows
Versions	Default: unaffected affected from 2.3000.*.252500 to 2.3000.1032164386.258709 (excl.)

References

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

Problem Types

Improper Neutralization of Null Byte or NUL Character (CWE-158)