CVE-2026-26154
HIGHCVSS 7.5/10EPSS 1.06%
Last modified
CVE-2026-26154 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.. EPSS estimates a 1.06% chance of exploitation in the next 30 days.
Description
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows Server 2012 | All versions |
| Microsoft | Windows Server 2012 | r2 |
| Microsoft | Windows Server 2016 | < 10.0.14393.9060 |
| Microsoft | Windows Server 2019 | < 10.0.17763.8644 |
| Microsoft | Windows Server 2022 | < 10.0.20348.5020 |
| Microsoft | Windows Server 2022 23h2 | < 10.0.25398.2274 |
| Microsoft | Windows Server 2025 | < 10.0.26100.32690 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-26154?
Improper input validation in Windows Server Update Service allows an unauthorized attacker to perform tampering over a network.
How severe is CVE-2026-26154?
CVE-2026-26154 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.06% probability of exploitation in the next 30 days.
How do I fix CVE-2026-26154?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-26154?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST