Executive Summary
Vectra AI describes prompt injection as OWASP's top LLM risk, notes real CVEs have been assigned for it, says most successful attacks leak data, and outlines six layers of defence.
What Happened
Vectra AI describes prompt injection as the top OWASP LLM risk and notes that real-world prompt injection vulnerabilities have already been assigned CVEs, demonstrating concrete exploitability in deployed AI products.[6] The piece cites data showing that the vast majority of successful prompt injection attacks cause sensitive data leakage and outlines a six-layer defense-in-depth strategy for enterprises, including input validation, tool least privilege, output monitoring, continuous red teaming, and compliance alignment.[6]
Vulnerability / Attack Technique
Prompt injection (overview)
Technical Mechanism
Overview of types, real CVEs and defences.
AI Security Category
LLM01:2025 Prompt Injection
Part of the Prompt Injection topic.
Relevant Frameworks
RealGround Analysis
Defence in depth is the consensus. RealGround analysis: tool least privilege is the layer that most limits damage.
Recommended Controls
- Apply least privilege to agent tools
- Validate inputs and filter outputs
Related RealGround Service
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Sources
Vectra AI: https://www.vectra.ai/topics/prompt-injection
Summary and analysis written by RealGround from the source above; last updated 2026-10-18.