3 reasons prompt injection is stubborn: 1. Instructions and data look identical to the model 2. The attack surface is every input 3. Blocklists do not hold across rephrasings https://heysec.com/2026/07/prompt-injection-101-for-the-llm-apps-youre-shipping/

Prompt injection 101 for the LLM apps you're shipping. For developers. What it is, why filters fall short, and the practical pattern: scan, then contain. https://heysec.com/2026/07/prompt-injection-101-for-the-llm-apps-youre-shipping/

A green scanner dashboard and a known AI exposure are not the same thing. Scans cover the surface you have always had. AI features read a new surface that scanners were never built to inspect. https://heysec.com/2026/06/your-scans-are-clean-do-you-know-your-ais-exposure/

Microsoft recorded CVE-2026-26030 and CVE-2026-25592 for prompt injection in Semantic Kernel. Calling this "by design" confirms a clear risk: malicious text driving tool actions is a recognized threat. https://heysec.com/2026/06/what-prompt-injection-is-and-why-microsoft-is-filing-cves/

An applicant hides invisible text on a resume ordering your AI to pass them through. The recruiter misses it entirely, but the machine obeys without question. This is known as prompt injection. https://heysec.com/2026/06/what-prompt-injection-is-and-why-microsoft-is-filing-cves/

Two flavors of prompt injection: Direct: the user types it. Visible. Indirect: a hidden line inside content your AI reads. The user never saw it. Indirect is the harder one. Any app that summarises pages or answers from documents is exposed. https://heysec.com/2026/07/what-is-prompt-injection-...

Join the waitlist to get a heads-up as soon as we’re ready to help protect your AI

What is prompt injection, and how do you stop it? Plain-language explainer. Direct vs indirect injection, why filters do not hold, and 5 practical habits to start today. https://heysec.com/2026/07/what-is-prompt-injection-and-how-do-you-stop-it/

If your team uses Microsoft Semantic Kernel: read both halves of the answer to those CVEs. Agent-side defence is in Microsoft's post. Prompt-boundary containment is what heySec ships. https://heysec.com/2026/06/microsoft-put-cves-on-prompt-injection-heres-containment/

Half the LLM security checklist is the same problem. The model cannot tell your instructions apart from instructions hidden in the content it reads. Patch each symptom: endless. Fix the root cause: most of the list closes. https://heysec.com/2026/06/a-plain-language-security-checklist-for-develo...

Do these 3 before lunch from yesterday's checklist: 1. Map your untrusted inputs 2. Stop running model output as code 3. Add a confirm step on your one riskiest action Meaningfully ahead of most LLM apps in prod. https://heysec.com/2026/06/a-plain-language-security-checklist-for-developers-shi...

Shipped an LLM feature and not sure it's secure? A plain-language checklist for developers. 7 items, one afternoon, no acronyms. Prompt injection, output handling, RAG, agent tool-use, and more. https://heysec.com/2026/06/a-plain-language-security-checklist-for-developers-shipping-llm-apps/

EU teams reading Microsoft's prompt-injection CVEs: containment is also a data-residency question. heySec: EU-built, EU-hosted, GDPR by default. No prompt export. https://heysec.com/2026/06/microsoft-put-cves-on-prompt-injection-heres-containment/

A CV with one line of white text on a white background. No human sees it. Your AI screening agent reads it and follows the hidden instruction. Your scans will not catch this. https://heysec.com/2026/06/your-scans-are-clean-do-you-know-your-ais-exposure/

Microsoft's CVEs split the agent-security stack in half. Agent-side hardening is yours. Prompt-boundary containment is the half teams thought their framework owned. heySec ships that half. https://heysec.com/2026/06/microsoft-put-cves-on-prompt-injection-heres-containment/

Standard scanners miss your new AI tools. Any bot reading untrusted text adds a hidden attack surface. https://heysec.com/2026/06/your-scans-are-clean-do-you-know-your-ais-exposure/

Microsoft's Defender team didn't call the Semantic Kernel CVEs bugs. They said 'developed by design.' When LLMs get plugins, prompt injection IS execution. heySec ships the prompt-side half. https://heysec.com/2026/06/microsoft-put-cves-on-prompt-injection-heres-containment/

Microsoft just shipped CVEs against its own Semantic Kernel. Frame: 'not bugs, developed by design.' Prompt injection in agent frameworks IS execution. heySec ships the prompt-boundary half. https://heysec.com/2026/06/microsoft-put-cves-on-prompt-injection-heres-containment/

We have been working secretly on a new Prompt Firewall to make LLM app protection simpler and more accessible to everyone (with a free! tier). We still have some red teaming and load testing to do. But you can sign up to get a ping when we're ready: https://heysec.com/waitlist

Prompt injections are tricky, and we needed a way to protect our products, so we built a solution. After all that effort, it would be a waste to keep it to ourselves, so we’re working to release it as a dedicated product. We’ve already mapped 7976 injection vectors, and counting🚓

We have reached the internal testing phase. Public testing coming up soon 👀

Testing our new upcoming solutions is in full swing 👀

More about this soon 👀

We’ve now built agents that autonomously optimize and improve other teams of agents. This includes optimizing not only data or prompts but the entire codebase. Of course, it includes guardrails and easy rollbacks to maintain stability and recover from possible mistakes.

We are building something truly exciting together with @ailab.ee 🤫

Unexpected events can hit any business. Being prepared means faster recovery and protecting customers, reputation, and profits. Here's a guide on 3 key disaster recovery plans. #DisasterRecovery https://heysec.com/2025/05/30/protect-your-business-with-three-essential-disaster-recovery-plans/

Your website is a prime target for cybercriminals. Don't ignore broken security like you wouldn't ignore broken office locks. #WebsiteSecurity https://heysec.com/2025/05/25/how-to-protect-your-business-website-from-common-security-threats-and-data-breaches/

A strong disaster recovery plan is vital during cyber crises like ransomware attacks. Protect your business by ensuring quick recovery and continuity. Learn how to prepare effectively! #DisasterRecovery #BusinessSecurity https://heysec.com/2025/05/09/business-disaster-recovery-planning/

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