CVE-2026-55007CWE-415

CVE-2026-55007

High · published September 8, 2026

CVSS v3.1
8.1
EPSS
1%
Percentile
52.9
In the wild
Unconfirmed
What it is

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

The record
Technical detail
CVSS v3.1
8.1 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00707 · 52.9th percentile
Weakness
CWE-415 · Double Free
Published
2026-09-08T22:17Z
Affected products (3)
ProductVersionsFixed in
microsoft/exchange_serverall versions—
microsoft/exchange_serverall versions—
microsoft/exchange_server_subscription_edition< 15.02.2562.04915.02.2562.049
References (1)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55007 · [email protected]
EPSS history
Timeline
  • 10 SEP 03:17Z
    EPSS moved — → 1%
    epss
  • 08 SEP 17:10Z
    Microsoft Exchange Server Remote Code Execution Vulnerability
    cvelistv5