{
 "license": "CC-BY-4.0",
 "attribution": "Fide AI, Agentic Cyber Explorer",
 "url": "https://agentic-cyber-explorer.pages.dev/events/brave-opera-neon-prompt-injection-2025/",
 "asOf": "2026-09-26",
 "id": "brave-opera-neon-prompt-injection-2025",
 "date": "2025-10-31",
 "datePrecision": "day",
 "title": "Brave discloses hidden-HTML prompt injection in Opera Neon, fixed within a week of re-engagement",
 "lane": "attack",
 "kind": "vulnerability-disclosure",
 "summary": "Brave reports that concealed elements in page markup could instruct Opera Neon's assistant, when asked about a page, to pull data such as email addresses from the user's other logged-in sites. Reported via Bugcrowd on 2025-10-14 and initially closed as not applicable, Opera then deployed a fix on 2025-10-21 that Brave confirmed.",
 "whyItMatters": "It adds a third agentic browser to the pattern of cross-site actions triggered by page content.",
 "actors": [
  "brave",
  "opera"
 ],
 "topics": [
  "prompt-injection",
  "data-exfiltration"
 ],
 "atlas": [
  "untrusted-content",
  "credentials"
 ],
 "artifacts": [],
 "sources": [
  {
   "url": "https://brave.com/blog/prompt-injection-flaw-opera-neon/",
   "publisher": "Brave",
   "title": "Prompt injection flaw in Opera Neon",
   "date": "2025-10-31",
   "type": "primary",
   "accessed": "2026-09-25"
  }
 ],
 "keyFacts": [
  {
   "fact": "Timeline: reported 2025-10-14; closed as not applicable 2025-10-17; fix deployed and confirmed 2025-10-21; Opera published details 2025-10-23.",
   "locator": "Disclosure timeline"
  }
 ],
 "significance": 2,
 "fideQuestions": [],
 "methods": [
  "indirect-prompt-injection"
 ],
 "review": "assistant-drafted",
 "addedOn": "2026-09-25"
}