Shesha (@security_sesha) header
Shesha (@security_sesha) profile picture

Speaker | Trainer - AppSec | OSWE | OSCP | CISSP. Tweets or likes are my bookmarks to access those on PC, mobile or in transit. https://nitter.gq/t.co/pzKHcVpNhD

NY/ NJ transit / NJ
Joined October 2012
Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)Photo by Shesha (@security_sesha)
Replying to @security_sesha
One more awesome cert from OffSec #OSWE #offsec
3
15
With @hash_kitten, we've been looking into Cloudflare's /cdn-cgi/image endpoint and managed to get an XSS :D To achieve this, we used what I believe to be a new CSP bypass involving the Cache-Control response header, combined with a sanitizer bypass! I hope you'll enjoy it! 👇
Our security research team discovered a cross-site scripting vulnerability in Cloudflare's /cdn-cgi/image/ endpoint by chaining an SVG sanitizer bypass with a new Cache-Control header trick to bypass the CSP. The issue was reported to Cloudflare and has since been fixed. You can read more here: slcyber.io/research/cache-me…
7
46
1
185
7,236
solid work from the Deepmind team capsem.org/ hypervisor written in rust that runs concurrent OCI containers in a specialised hardened Linux vm
4
21
197
13,575
LLMs are great at finding bugs, but so are fuzzers. @5aelo compared the vulnerabilities found in V8 by BigSleep, an agentic system, with those found by the Fuzzilli fuzzer. projectzero.google/2026/10/f…
13
100
7
413
36,524
This is required reading for anyone who has complicated feelings on the state of offensive security. One of the best posts I've read in a long time. atredis.com/blog/2026/10/22/…
3
31
1
155
9,318
AI Security Roadmap: 10 Core Areas 01 | AI Security Fundamentals: What Can Go Wrong? AI Threats → Attack Surface → Risk Assessment → Threat Modeling → Trust Boundaries → Security Controls → AI Policies → Governance → Compliance → Risk Management 02 | LLM Attack & Defense: How Do You Secure LLMs? Prompt Injection → Jailbreaking → Data Leakage → System Prompt Theft → Unsafe Outputs → Input Filtering → Output Validation → Guardrails → Red Teaming → Evaluation 03 | AI Application Security: How Do You Secure AI Apps? Authentication → Authorization → API Security → Input Validation → Output Encoding → Rate Limiting → Secrets Management → Sandboxing → Access Control → Security Testing 04 | RAG Security: How Do You Protect AI Knowledge Systems? Data Poisoning → Document Validation → Access Control → Embedding Security → Vector DB Security → Retrieval Filtering → Context Injection → Source Validation → Data Isolation → Audit Logs 05 | AI Agent Security: How Do You Secure Autonomous Agents? Tool Abuse → Excessive Permissions → Prompt Injection → Memory Poisoning → Identity Control → Tool Allowlisting → Sandboxing → Human Approval → Action Validation → Audit Trails 06 | AI Data Privacy: How Do You Protect Sensitive Data? Data Discovery → PII Detection → Classification → Masking → Encryption → Access Policies → Data Minimization → Retention Controls → Secure Deletion → Privacy Audits 07 | AI Model Security: How Do You Protect Models? Model Theft → Model Extraction → Model Poisoning → Backdoors → Weight Protection → Artifact Signing → Provenance Checks → Access Control → Integrity Validation → Model Monitoring 08 | AI Infrastructure Security: How Do You Secure AI Workloads? Cloud IAM → Network Isolation → GPU Security → Container Security → Kubernetes Hardening → Secrets Protection → Image Scanning → Runtime Security → Patch Management → Compliance 09 | AI Security Testing: How Do You Find Vulnerabilities? Threat Modeling → Attack Simulation → Prompt Injection Testing → Adversarial Testing → Red Teaming → Model Evaluation → Vulnerability Scanning → Risk Scoring → Remediation → Retesting 10 | AI Security Operations: How Do You Detect and Respond? Telemetry → Logging → Anomaly Detection → Abuse Monitoring → Threat Detection → Alerting → Incident Triage → Containment → Forensics → Continuous Improvement
3
33
1
231
13,787
“We don’t use PHP” doesn’t settle your PHP2Shell exposure. Third-party products, containers, and hosted apps may carry the runtime. Finding it starts the investigation; exploitability and impact depend on the environment. Read our analysis to understand what PHP2Shell means and why you should be paying attention 👇 bit.ly/3WG3my2
9
22
1,749
New on our Frontier Red Team blog: using Claude to formally verify software at large scale. Formal verification can prove that code is free of certain bugs, but historically it has only been feasible for small codebases (or required a lot of expert time). With AI models, however, this is beginning to change. In collaboration with @theoremlabs, we used Claude to prove security properties in over one hundred real-world open-source libraries over the span of a few weeks. Read our research in full here: anthropic.com/research/forma…
663
1,072
639
9,781
2,094,889
Reducing the attack surface of deployed services and apps is a fundamental component of software that is secure by design. Earlier this year we tasked Claude with autonomously mapping and reducing the attack surface of 25 large and widely used OSS codebases. This blog post covers some of our methodology and a preview of the data we collected. This research resulted in a significant reduction in OpenSSH pre-authentication attack surface (now fixed in 10.6). And over 500 findings where reachability could be reduced and configurations hardened to ensure security controls weren’t silently disabled. anthropic.com/research/attac…
8
72
13
553
86,538
How’s that FOMO holding up one month on? 👀 Whether you missed out or just want to relive the best bits, the unprompted.au talks are now online! All the AI. All the cyber. None of the FOMO. 🐙 youtube.com/@unpromptedAU
21
1
68
9,288
LeetCode, but for ML and AI. We have LeetCode for DSA. But where's the LeetCode for AI engineers? This is not a 10-hour YouTube tutorial. Your ordinary "Build an AI agent in 5 minutes" course. I mean actual engineering challenges: → Implement backpropagation without PyTorch. → Build a tokenizer from scratch. → Write your own attention mechanism. → Build RAG without relying on frameworks. → Create an AI agent loop from scratch. → Learn how to evaluate and debug AI systems. So I built something I wish existed when I started learning AI. 🔗 aiengineeringfromscratch.com… The idea is simple: 1. Understand the problem. 2. Learn the math behind it. 3. Implement it yourself. 4. Run the tests. 5. Actually understand what you built. From ML fundamentals to transformers, LLMs, RAG, and AI agents. ✅ 100% open source ✅ Completely free ✅ No paywalls or signups ✅ Learn by building, not just watching LeetCode taught a generation of engineers how to solve algorithms. Maybe it's time we had something similar for building AI. If you're serious about becoming an AI engineer, stop just calling APIs. Start understanding what's behind them. ♻️ Repost this for someone learning AI. 💯 Completely Opensource and FREE with 71K stars P.S. Would you use a daily LeetCode-style challenge for AI engineering?
1
44
2
241
9,098
AWS Architecture (30+ Visuals) techfusionist.substack.com/p…
2
36
2
252
24,353
An example of why automotive security is so fun: No CFI, No ASLR, MMU/MPU not configured, Everything RWX
0-click RCE on Tesla Model 3 through TPMS Sensors cc @_p0ly_ @masthoon @vdehors synacktiv.com/sites/default/…
6
22
3
182
12,191
Shesha retweeted
0-Click RCE on the Tesla Infotainment Through Cellular Network cc @_p0ly_ @vdehors synacktiv.com/sites/default/…
3
57
4
451
26,604
What a rollercoaster. 7 weeks, 5 RCEs on Pixel 10 & 11, all officially patched by Google today. Chuffed to bits. The bounty won’t have us popping champagne, but popping Chrome? That we can do all day. The real payout was always the patch. Demo 👇
5
18
2
133
14,671
Shesha retweeted
CryptSn0w is now open source! An obsolete untethered #jailbreak for iOS27 and devices up to A20 Pro, exploiting a rare Apple server-side TSS/Cryptex bug. 🔥
4
21
1
275
57,634