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Author Bio


Dennis Fisher

Editor

Dennis Fisher is an award-winning journalist and author. He is one of the co-founders of Decipher and Threatpost and has been writing about cybersecurity since 2000. Dennis enjoys finding the stories behind the headlines and digging into the motivations and thinking of both defenders and attackers. He is the author of 2.5 novels and once met Shaq. Contact: dennis at decipher.sc.

dennis@decipher.sc

Featured Articles


Phreaks and Geeks: Joybubbles and the Pre-History of Hacking

The proto hacker whose innate ability, curiosity, and absolute joy in the act of discovery is conveyed so artfully in the new documentary Joybubbles.

By Dennis Fisher

February 2, 2026 | 4 min read

Hackers

Fortinet and WinRAR Exploitation, Google’s IPIDEA Disruption, and Our Favorite Cybersecurity Creators

It was a busy week in the cybers! Today we start with the targeted exploitation of another Fortinet vulnerability (CVE-2026-24858) that enables simple authentication bypass (1:15), then we discuss Google’s disruption of a large residential proxy network called IPIDEA that has been abused by hundreds of threat actors (5:40), then we talk about the continued attacks on an older WinRAR […]

By Dennis Fisher

January 30, 2026 | 1 min read

GooglePodcastVulnerability

Google Disrupts IPIDEA Residential Proxy Network

Google researchers observed more than 550 individual threat groups using IPIDEA exit nodes during a one-week period earlier this month. 

By Dennis Fisher

January 29, 2026 | 3 min read

GoogleMalware
intrusion

Cybercrime and APT Groups Exploiting WinRAR Bug

Exploitation of CVE-2025-8088 in the wild began before disclosure, with attacks confirmed as early as July 18, 2025.

By Dennis Fisher

January 27, 2026 | 4 min read

MicrosoftVulnerability

Microsoft Releases Emergency Patch for CVE-2026-21509

The vulnerability (CVE-2026-21509) requires user interaction for an attack to succeed, with the most likely vector being an attacker sending a malicious Office file to a victim, who then opens it. 

By Dennis Fisher

January 26, 2026 | 1 min read

MicrosoftVulnerability
Fiber optic cables

Fortinet FortiGate Devices Targeted in New Campaign

This activity shares some similarities with a campaign that researchers at Arctic Wolf identified in December. That campaign started soon after Fortinet disclosed two authentication bypass flaws (CVE-2025-59718 and CVE-2025-59719).

By Dennis Fisher

January 22, 2026 | 3 min read

FortinetVulnerability
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