Industry Newsprompt injectioncopilotvaronissecurity
Microsoft Fixes Copilot Reprompt Data Leak
9.1
Microsoft patched a single-click prompt injection named 'Reprompt' in the consumer version of Copilot during the first Patch Tuesday of the year, after data security vendor Varonis reported the flaw. Reprompt could exfiltrate conversation history, file attachments, location, and user details by chaining attacker-controlled prompts via a ?q= parameter; users should avoid suspicious links and review prefilled prompts.
Key Points
- 1Identifies Reprompt single-click prompt injection exfiltrating Copilot session data via a crafted ?q= parameter.
- 2Demonstrates authenticated Copilot sessions can be hijacked to leak conversation history, files, and user metadata.
- 3Advise practitioners to validate prefilled prompts, avoid suspicious links, patch promptly, and monitor session activity.
Scoring Rationale
High novelty and actionable patching elevate impact; scope limited to consumer Copilot sessions and lacks an assigned CVE.
Sources
Public references used for this report.
Practice interview problems based on real data
1,625 SQL & Python problems across 15 industry datasets — the exact type of data you work with.
Try 250 free problems
