User-assisted unauthenticated privilege escalation
Published Aug 6, 2026 · Updated Aug 25, 2026
Improper authorization in Microsoft Copilot Cowork allows remote attackers to gain elevated privileges over a network. Microsoft has disclosed neither the affected Copilot Cowork component nor the authorization check that mishandles untrusted requests, so the public mechanism remains undisclosed. Microsoft's published scoring requires no existing privileges but does require user interaction, and the stated impact is limited to confidentiality and integrity rather than service interruption.
Summary
What happened
Improper authorization in Microsoft Copilot Cowork allows remote attackers to gain elevated privileges over a network. Microsoft has disclosed neither the affected Copilot Cowork component nor the authorization check that mishandles untrusted requests, so the public mechanism remains undisclosed. Microsoft's published scoring requires no existing privileges but does require user interaction, and the stated impact is limited to confidentiality and integrity rather than service interruption.
The record
- CVE
- CVE-2026-59118
- Published
- Aug 6, 2026
- Updated
- Aug 25, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-285, T1068
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 6, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo