Sep 8, 2026 · 8 min
Browser extensions turn trusted access into attack infrastructure
PEEP browser backdoors, $320M Liquid exploit, BigBear beats MFA
PEEP shows how a familiar browser add-on can become a post-exploitation backdoor capable of bypassing protections and stealing cookies.
- 1PEEP disguises a post-exploitation toolkit as a smart-bookmarks extension for Chrome and Edge.
- 2The episode connects browser compromise with broader threats involving cryptocurrency infrastructure, Microsoft 365, and multifactor authentication.
- 3Sarah Lane presents a compact set of headlines showing how trusted tools can conceal attacker access.
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The episode explains how PEEP disguises post-exploitation capabilities as a smart-bookmarks extension that can bypass browser protections and steal cookies.
The brief
Sarah Lane opens the September 8, 2026 edition with a warning about PEEP, a post-exploitation toolkit hiding inside a smart-bookmarks extension for Chrome and Edge.
PEEP matters because it can bypass browser protections and steal cookies, turning software that looks useful and familiar into a foothold for attackers.
The wider headline mix moves from the Liquid Network and Bitcoin ecosystem to Microsoft 365 threats, including Big Bear 2.0’s phishing-as-a-service operation.
The episode’s clearest warning is simple: browser extensions deserve scrutiny because legitimate-looking functionality can conceal post-exploitation capabilities.
The segment closes by pointing listeners to CISOseries.com for the full stories behind the weekday cybersecurity headlines.