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Wednesday, 28 October 2026
5 agent hacks today▼ 5 vs yesterday (10)
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Incident database

Multiple vulnerabilities in Microsoft Copilot products

Two vulnerabilities were disclosed in Microsoft's Copilot products: a race condition in Copilot Chat allowing information disclosure, and improper cryptographic signature verification in Copilot Studio allowing privilege escalation.

Disclosed 28 August 2026 · Record updated 1 October 2026

Impact

Race condition in Copilot Chat allows information disclosure to authorized attackers; improper signature verification in Copilot Studio allows unauthorized privilege escalation.

Our coverage

No articles linked to this incident yet.

Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-58616
  2. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-80098
  3. github.comhttps://github.com/advisories/GHSA-r9hf-26xj-x88v