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| 23 Apr 2026 | |
| Written by Gabi Gerber | |
| Attacks & Threats |
On March 10, 2026, Microsoft patched CVE-2026-26144, a cross-site scripting (XSS) vulnerability in Excel. XSS in Office isn't anything new, but what makes this XSS different is what happens after the script executes.
The vulnerability chains with Copilot Agent mode. An attacker embeds a malicious payload in an Excel file. After a user opens it, the XSS fires without the user ever clicking anything. However, unlike most XSS attacks, which aim to steal a session cookie or redirect the user to a phishing site, this attack hijacks the Copilot Agent and silently exfiltrates data from the spreadsheet to an attacker-controlled endpoint: no user interaction, no visual prompt to indicate that anything had happened. The AI does the exfiltration for you. More here
Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild. More...
A Nitrogen ransomware attack on Foxconn's North American facilities is one of 600 hits on manufacturers this year, as ga… More...
Malicious repositories can trigger code execution in Claude Code, Cursor CLI, Gemini CLI, and CoPilot CLI with minimal o… More...
Cyber adversaries have long used AI, but now attackers are using large language models to develop exploits and orchestra… More...
A proof-of-concept exploit (PoC) shows how someone with admin privileges can exploit the issue to steal passwords, and t… More...
Microsoft has disclosed a new security vulnerability impacting on-premise versions of Exchange Server that it said has come under active exploitation in the wild. More...
A Nitrogen ransomware attack on Foxconn's North American facilities is one of 600 hits on manufacturers this year, as ga… More...
Malicious repositories can trigger code execution in Claude Code, Cursor CLI, Gemini CLI, and CoPilot CLI with minimal o… More...
Cyber adversaries have long used AI, but now attackers are using large language models to develop exploits and orchestra… More...
A proof-of-concept exploit (PoC) shows how someone with admin privileges can exploit the issue to steal passwords, and t… More...
