InfoSecBulletin Cybersecurity for mankind
Meta-owned WhatsApp has released two new security warnings about flaws fixed earlier this year in the well-known messaging app. One issue is CVE-2026-23863, a medium-risk attachment spoofing problem that affects WhatsApp for Windows before version 2.3000.1032164386.258709.
An attacker could use the flaw to make a harmful document with NUL bytes in its name. When sent as an attachment, the receiver would think it’s a safe file, but it would run as a program when opened, WhatsApp’s notice says.
Hackers deploy Casbaneiro Trojan that activates on bank websites
German police read Signal, Telegram, WhatsApp messages without breaking encryption
Urgent Patch! cPanel, GitLab Flaws Expose Users to RCE, File and Credential Theft
Palo Alto PAN-OS Flaw Enables Root Arbitrary Code Execution
Critical Check Point VPN flaws allow remote code execution attacks
Cisco confirms CVE-2026-20079 flaw in Secure FMC is exploited in attacks
Hackers exploit PaperCut flaws using hundreds of AI agents, compromising 440 servers globally
CISA Says Chinese Firms Extracted Billions of Tokens From Frontier AI Models
Nightmare Eclipse Drops New Microsoft Defender ‘ShieldCrash’ zero-day
cPanel Flaw Lets Hosting Accounts With Mail Privileges Execute Code as Root
The second flaw, CVE-2026-23866, has a ‘medium impact’ rating. It impacts WhatsApp for iOS (v2.25.8.0-v2.26.15.72) and WhatsApp for Android (v2.25.8.0-v2.26.7.10).
According to WhatsApp, incomplete validation of AI rich response messages for Instagram Reels could have allowed an attacker to “trigger processing of media content from an arbitrary URL on another user’s device, including triggering OS-controlled custom URL scheme handlers.”
WhatsApp has not given more details, but these custom URL problems could let bad actors send users to fake sites and open other apps on the device using URL schemes like facetime:, tel:, itms-apps:, or special app links.
The company states there is no proof of abuse in nature.
