Vulnerability · Published Aug 6, 2026 · Assigned by microsoft
CVE-2026-59118Copilot Cowork Elevation of Privilege Vulnerability
Critical 9.3
In plain English
A critical-severity security flaw in Copilot Cowork from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Severity (CVSS 3.1)9.3Critical
Exploit odds (30 days)0.7%top 46.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Copilot Cowork | - |
Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
References
- Copilot Cowork Elevation of Privilege Vulnerability vendor-advisory, patch