Severity: Medium New version Global Action required
OWASP releases Top 10 for LLM Applications 2026 with focus on tool access risks
Original title: The OWASP Top 10 for LLM Applications (2026): What Changed and Why It Matters
- Published
- Source: cloudsecurityalliance.org
- Effective
- Not stated
- Deadline
- Not stated
Why it matters
OWASP released its 2026 rankings for the Top 10 vulnerabilities in LLM applications, emphasizing risks from giving LLM applications access to tools and enterprise systems. Prompt injection remains the number one vulnerability, while excessive agency has risen to third place, reflecting the growing attack surface of production LLM deployments. Security teams should assume models will sometimes fail and enforce identity-based, least-privilege access controls outside the model itself.
What changed
- Prompt injection retains the top position in OWASP Top 10 for LLM Applications
- Excessive agency (model ability to take autonomous actions) rises to third place, reflecting increased deployment of agentic systems
- Several vulnerability categories expanded to cover newer deployment risks beyond chat interfaces
- Updated guidance emphasizes defense-in-depth approach with identity-based, least-privilege access controls as primary mitigation strategy
Who is affected
Security teams, organizations deploying LLM applications in production environments, enterprises integrating LLMs with tools and system access. Text does not specify company size or industry focus.
What to do
AI-assisted summary of the official document; the official text prevails. Not legal advice.