Analysis
Defending Against Indirect Prompt Injection Attacks With Spotlighting
Publication date unknown · Discovered arxiv.org
Page published
Publication date unknown · First observed: 4 Nov 2026
Coverage timeline
Single-source analysis — one report is available.
Why it matters
Indirect prompt injection can turn retrieved content into agent instructions, so defenders should combine untrusted-input handling with controls that limit the impact of successful attacks.
The DEV Community article explains layered defenses against indirect prompt injection, covering prevention, detection, and damage containment, with an example of Linkmortem ignoring instructions embedded in a web page. The linked Spotlighting study reports reducing attack success from above 50% to below 2% in GPT-family experiments with minimal impact on task performance.