by Kastro
Paper/Archive/CVE-2026-59118

CVE-2026-59118

Microsoft Copilot Cowork — Copilot Cowork Elevation of Privilege Vulnerability

EPSS 0.7%CVSS 9.3
critical.is priorityof 100
39
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 53.7.537 × 2010.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Improper authorization in Copilot Cowork allows an unauthorized attacker to elevate privileges over a network.

Affected

ProductAffectedFixed inSource
Copilot Cowork-–CNA

Scores by source

microsoft (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchmsrc.microsoft.com/update-guide/vulnerability/CVE-2026-59118