What Happened
Varonis Threat Labs has disclosed three vulnerabilities in Microsoft Copilot Personal that it said could allow a single click on a crafted link to silently pull data from connected apps and other information available to the victim's Copilot session. The flaws, which the researchers collectively named CoSnitch, turn in part on an undocumented URL parameter that the assistant itself surfaced
Why It Matters
Varonis Threat Labs reported three vulnerabilities in Microsoft Copilot Personal, collectively named CoSnitch, that could let a user be tricked by a single crafted click into silently pulling data from connected apps and other information available in the Copilot session. The report says the issue involves an undocumented URL parameter surfaced by the assistant itself. RealGround implication: this is a high-priority data-exfiltration and session-security risk for AI assistants connected to user apps, and it calls for audit of agent logic, abuse-path testing, and hardened link/parameter handling.
RealGround Analysis
This signal maps to data leakage. Organizations using AI agents, LLM APIs, SaaS integrations, or sensitive data workflows should review whether this class of issue could create unauthorized tool execution, data leakage, weak approval gates, or unmanaged supply-chain exposure.
Recommended Actions
- Restrict AI agent tool permissions and production write paths.
- Review sensitive data access across prompts, logs, embeddings, memory, and SaaS integrations.
- Add human approval workflows for high-impact or state-changing actions.
- Run prompt injection and indirect prompt injection tests against affected workflows.
- Document the owner, control gap, and remediation deadline for this risk class.
Source
https://thehackernews.com/2026/08/microsoft-copilot-personal-flaws-could.html