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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
A lack of technical details could make it hard for organizations running self-managed GitLab versions to detect potential exploitation of CVE-2026-19478. More...
A spear-phishing campaign by a China-nexus group linked to FamousSparrow provides insight into geopolitical, technical, … More...
The popular "Passportal" password manager, favored by MSPs and SMBs, remains risky even after its patch, thanks to its c… More...
Dark Reading Confidential Episode 20: Expert Rich Mogull reflects on lessons cyber teams should pull from the OpenAI age… More...
New research shows how attackers can use security alerts and blocked events to manipulate and hijack AI agents. More...
A lack of technical details could make it hard for organizations running self-managed GitLab versions to detect potential exploitation of CVE-2026-19478. More...
A spear-phishing campaign by a China-nexus group linked to FamousSparrow provides insight into geopolitical, technical, … More...
The popular "Passportal" password manager, favored by MSPs and SMBs, remains risky even after its patch, thanks to its c… More...
Dark Reading Confidential Episode 20: Expert Rich Mogull reflects on lessons cyber teams should pull from the OpenAI age… More...
New research shows how attackers can use security alerts and blocked events to manipulate and hijack AI agents. More...
