HermeticReader The Vulnerability That Turned Adobe's 300M-Install Extension Into a Full WhatsApp Takeover


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TLDR

A single click on a malicious web page could turn the Adobe Acrobat Chrome extension, installed on roughly 329 million browsers, into a one-click WhatsApp exfiltration tool, quietly handing a visitor's entire WhatsApp clear-text chats, contacts, and private info to the attacker's hands.

Here at Guardio Labs we uncovered a chain of vulnerabilities in the extension that compounds into a single powerful cross-origin exfiltration chain. A working, runtime-confirmed exploit followed within hours, thanks to our AI harness specially built to secure the browser extensions domain. Adobe's response to our full disclosure was phenomenal: acknowledged, patched, and shipped over a single weekend, with CVE-2026-48294 issued days later.

In this write-up we'll dig into the details of the exploitation chain and how Agentic AI no only broke all speed and efficiency records in vulnerability detection but actually changes this entire domain as we speak
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"HermeticReader" , The Vulnerability That Turned Adobe's 300M-Install Extension Into a Full WhatsApp Takeover

The Vulnerability That Turned Adobe's 300M-Install Extension Into a Full WhatsApp Takeover
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