CVE-2026-26137

9.9 criticalEPSS 0.5%

Critical (9.9) in microsoft 365 copilot chat. EPSS 0.5% chance of exploitation in the next 30 days.

Server-side request forgery (ssrf) in Microsoft Exchange allows an authorized attacker to elevate privileges over a network.

Severity

9.9 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2026-03-19
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19