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Microsoft Copilot vulnerability allowed data theft via secret prompt parameter

Researchers discovered a vulnerability in Microsoft Copilot Enterprise that allowed attackers to exfiltrate sensitive data, including user passwords, without explicit user confirmation. The exploit was uncovered by Varonis researchers who, through a series of questions, prompted Copilot to reveal an undocumented parameter, '?autorun=1', which bypassed the need for user consent when combined with a known parameter. Microsoft has since mitigated the vulnerability, first in February and with more comprehensive fixes recently, by altering how the chatbot handles input from URLs. AI

IMPACT Highlights potential security risks in AI assistants and the need for robust guardrails against prompt injection.

RANK_REASON Discovery of a vulnerability in a widely used AI product.

Read on Mastodon — mastodon.social →

AI-generated summary · Google Gemini · from 3 sources. How we write summaries →

Microsoft Copilot vulnerability allowed data theft via secret prompt parameter

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0 / 100
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Tool
Discovery of a vulnerability in a widely used AI product.
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3 independent sources
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product, safety
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50 days old
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COVERAGE [3]

  1. Ars Technica — AI TIER_1 English(EN) · Dan Goodin ·

    Microsoft Copilot reveals secret input that allowed it to be hacked

    Secret parameter allowed hackers to steal passwords when a target clicked on a link.

  2. Mastodon — mastodon.social TIER_1 English(EN) · [email protected] ·

    Microsoft Copilot reveals secret input that allowed it to be hacked Secret parameter allowed hackers to steal passwords when a target clicked on a link. https:/

    Microsoft Copilot reveals secret input that allowed it to be hacked Secret parameter allowed hackers to steal passwords when a target clicked on a link. https:// arstechnica.com/security/2026/ 08/microsoft-copilot-reveals-secret-input-that-allowed-it-to-be-hacked/ # Tech # Techno…

  3. r/singularity TIER_2 English(EN) · /u/JackFisherBooks ·

    Microsoft Copilot reveals secret input that allowed it to be hacked

    <table> <tr><td> <a href="https://www.reddit.com/r/singularity/comments/1vrtrrh/microsoft_copilot_reveals_secret_input_that/"> <img alt="Microsoft Copilot reveals secret input that allowed it to be hacked" src="https://external-preview.redd.it/4kV-82rXs1-pg9duIA6DUstbX3JJdcl-FZma…