CVE-2025-26647 — Improper Input Validation in Microsoft Windows Server 2008 R2 Service Pack 1

CWE-20 — Improper Input Validation10 documents7 sources
Severity
8.8HIGHNVD
EPSS
2.6%
top 14.39%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
10
Microsoft Windows Server 2008 R2 Service Pack 1Microsoft Windows Server 2008 Service Pack 2Microsoft Windows Server 2012+7 more
Timeline
PublishedApr 8
Latest updateJun 11

Description

Improper input validation in Windows Kerberos allows an authorized attacker to elevate privileges over a network.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages9 packages

▶NVDmicrosoft/windows< 10.0.14393.7969+5
▶CVEListV5microsoft/windows_server_20126.2.9200.0 — 6.2.9200.25423
▶CVEListV5microsoft/windows_server_201610.0.14393.0 — 10.0.14393.7969
▶CVEListV5microsoft/windows_server_201910.0.17763.0 — 10.0.17763.7136
▶CVEListV5microsoft/windows_server_202210.0.20348.0 — 10.0.20348.3453

🔴Vulnerability Details

2
GHSA
GHSA-c4pv-p44r-9xfc: Improper input validation in Windows Kerberos allows an unauthorized attacker to elevate privileges over a network↗2025-04-08
▶
CVEList
Windows Kerberos Elevation of Privilege Vulnerability↗2025-04-08
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📋Vendor Advisories

1
Microsoft
Windows Kerberos Elevation of Privilege Vulnerability↗2025-04-08
▶

🕵️Threat Intelligence

6
Bleepingcomputer
Microsoft fixes Windows Server auth issues caused by April updates↗2025-06-11
▶
Bleepingcomputer
Microsoft: April updates cause Windows Server auth issues↗2025-05-07
▶
Qualys
Microsoft and Adobe Patch Tuesday, April 2025 Security Update Review | Qualys↗2025-04-08
▶
Bleepingcomputer
Microsoft April 2025 Patch Tuesday fixes exploited zero-day, 134 flaws↗2025-04-08
▶
Qualys
Microsoft and Adobe Patch Tuesday, April 2025 Security Update Review↗2025-04-08
▶
CVE-2025-26647 — Improper Input Validation in Microsoft | cvebase