Detections
Analytics

CVE-2026-55007

high

Description

Double free in Microsoft Exchange Server allows an unauthorized attacker to execute code over a network.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007

https://www.helpnetsecurity.com/2026/09/09/september-2026-patch-tuesday-zero-days-sigred-successor/

https://thehackernews.com/2026/09/microsoft-patches-record-974-flaws.html

https://securityaffairs.com/198705/security/microsofts-biggest-patch-tuesday-974-cves-2-zero-days-and-20-wormable-bugs.html

https://www.securityweek.com/microsoft-patches-record-974-vulnerabilities-including-two-exploited-zero-days/

Details

Source: Mitre, NVD

Published: 2026-09-08

Updated: 2026-09-09

Risk Information

CVSS v2

Base Score: 7.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.1

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

Severity: High

EPSS

EPSS: 0.00726