{
 "license": "CC-BY-4.0",
 "attribution": "Fide AI, Agentic Cyber Explorer",
 "url": "https://agentic-cyber-explorer.pages.dev/events/brave-unseeable-injections-comet-fellou-2025/",
 "asOf": "2026-09-26",
 "id": "brave-unseeable-injections-comet-fellou-2025",
 "date": "2025-10-21",
 "datePrecision": "day",
 "title": "Brave finds screenshot and navigation prompt injections in Comet and Fellou browsers",
 "lane": "attack",
 "kind": "vulnerability-disclosure",
 "summary": "Brave reports that Comet could read faint, low-contrast text embedded in images when a user asked about a screenshot, and that Fellou sent visited page text to its model on simple navigation, letting on-page instructions override user intent. Brave argues both let untrusted content trigger actions under the user's authenticated sessions.",
 "whyItMatters": "Injection surfaces in agentic browsers extend beyond page text to images and routine navigation.",
 "actors": [
  "brave",
  "perplexity",
  "fellou"
 ],
 "topics": [
  "prompt-injection",
  "data-exfiltration"
 ],
 "atlas": [
  "untrusted-content",
  "credentials"
 ],
 "artifacts": [],
 "sources": [
  {
   "url": "https://brave.com/blog/unseeable-prompt-injections/",
   "publisher": "Brave",
   "title": "Unseeable prompt injections in screenshots: more vulnerabilities in Comet and other AI browsers",
   "date": "2025-10-21",
   "type": "primary",
   "accessed": "2026-09-25"
  }
 ],
 "keyFacts": [
  {
   "fact": "Disclosure windows: Perplexity 2025-10-01 to 2025-10-21; Fellou 2025-08-20 to 2025-10-21.",
   "locator": "Disclosure timeline"
  }
 ],
 "significance": 3,
 "fideQuestions": [],
 "methods": [
  "indirect-prompt-injection"
 ],
 "review": "assistant-drafted",
 "addedOn": "2026-09-25"
}