CRITICAL 9.3 Microsoft
CVE-2026-59118
Copilot Cowork Elevation of Privilege Vulnerability
Microsoft Security Update 2026-Aug: Copilot Cowork Elevation of Privilege Vulnerability
Affected Products
- Copilot Cowork
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59118
- https://nvd.nist.gov/vuln/detail/CVE-2026-59118
This critical severity vulnerability with a CVSS score of 9.3 was published on 2026-08-11 via Microsoft. Affected: Copilot Cowork.
Risk Timeline
CVE Disclosed2026-08-11 · 40 days ago
Remediation Resources
Official Advisory
msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59118NVD / MITRE
nvd.nist.gov/vuln/detail/CVE-2026-59118Related Vulnerabilities
| CVE | Title | Severity | CVSS |
|---|---|---|---|
| CVE-2026-24301 | Microsoft Copilot Information Disclosure Vulnerability | HIGH | 8.8 |
| CVE-2026-47644 | Copilot Chat (Microsoft Edge) Information Disclosure Vulnerability | MEDIUM | 6.5 |
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