Skip to content
← home
Casey Ellis

Casey Ellis

Hacker, founder, advisor, and pioneer of crowdsourced security. Founder of Bugcrowd, co-founder of disclose.io, principal of Tall Poppy Group. Board member at SRLDF.

Hot Takes

Find it and fix it

A fun exercise: run various models against deliberately vulnerable apps, and eval them on their ability to identify the vulns and effectively patch them

08 Jul 2026 · 1 min read
Hot Takes

Prompt-injection bumper stickers

Prompt injection is climbing out of the chat box and into the physical world. Print an adversarial instruction big enough for a camera to

07 Jul 2026 · 1 min read
Hot Takes

Words mean things

If the AI era teaches you anything, let it be the lesson that words mean things.

06 Jul 2026 · 1 min read
Security

Slopdemic, Not Vulnpocalypse (Yet)

I joined Sherrod DeGrippo on the Microsoft Threat Intelligence Podcast this week to talk about how AI is reshaping vulnerability research, disclosure, and patching.

05 Jul 2026 · 2 min read
Johnny Five from Short Circuit rendered as an Obama 'Hope' campaign poster, captioned NO DISASSEMBLE
Building

My Clanker Setup

A mate messaged me this week asking whether I'd ever written up my clanker setup: which harness I run, which models, what

05 Jul 2026 · 7 min read
Security

AI Didn't Break Vulnerability Disclosure. It Exposed What Was Already Broken.

There's a sentence I keep coming back to from a conversation Josh Bressers and I had recently on Open Source Security: we&

29 Jun 2026 · 4 min read
Casey Ellis on VulnCheck Threat Con One — vulnerability disclosure post-Mythos
Thinking

The Hitchhiker's Guide to Bug Bounty and Vulnerability Disclosure in 2026

Post-Mythos vulnerability disclosure: a 2026 field guide for vendors and researchers on AI-era bug bounties, slop triage, and rebuilding ecosystem norms.

17 May 2026 · 13 min read
Policy

Coordinated, Until It Isn't

Everyone has a take on Moksha's 89-vuln XAPI drop. Almost everyone misses the same thing: it wasn't one decision, it was four: go public, go Day-0, withhold patches from Citrix, lean into the "shittrix" frame. Coordinated disclosure runs on goodwill, and the goodwill runs out sometimes.

17 May 2026 · 9 min read
Security

Auditing My 2026 Security Predictions: Five Months In

Back in December I made eight predictions for what 2026 would bring in security. We're four months in, so it's

15 May 2026 · 7 min read
Security

Thoughts on the #slopdemic

Move over #vulnpocalypse — there's a new term we need to talk about: the #slopdemic. AI didn't invent low-quality vuln reports, but it just turbocharged them, and F/OSS is drowning.

04 May 2026 · 2 min read
Thinking

The "irrational asymmetry" in threat behavior

We've traditionally thought about defense through the lens of a financially motivated attacker or a nation state — predictable rewards. Open it to

04 May 2026 · 1 min read
Personal

Continued Monitoring of the Situation

Week two of an AI-powered House Finch nest monitor: four model biases, a Wyze cam back from the dead, and a full pipeline rewrite before the eggs hatch.

03 May 2026 · 14 min read