CVE-2026-20929
published 2026-01-13CVE-2026-20929: Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
PriorityP351high7.5CVSS 3.1
AVNACHPRLUINSUCHIHAH
EPSS
1.14%
63.0th percentile
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
Affected
37 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.8783 | 10.0.14393.8783 |
| microsoft | windows_10_1809 | < 10.0.17763.8276 | 10.0.17763.8276 |
| microsoft | windows_10_21h2 | < 10.0.19044.6809 | 10.0.19044.6809 |
| microsoft | windows_10_22h2 | < 10.0.19045.6809 | 10.0.19045.6809 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.8783 | 10.0.14393.8783 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8276 | 10.0.17763.8276 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.6809 | 10.0.19044.6809 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.6809 | 10.0.19045.6809 |
| microsoft | windows_11_23h2 | < 10.0.22631.6491 | 10.0.22631.6491 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.6491 | 10.0.22631.6491 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.6491 | 10.0.22631.6491 |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008_r2_service_pack_1 | >= 6.1.7601.0 < 6.1.7601.28117 | 6.1.7601.28117 |
| microsoft | windows_server_2008_service_pack_2 | >= 6.0.6003.0 < 6.0.6003.23717 | 6.0.6003.23717 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25868 | 6.2.9200.25868 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.22968 | 6.3.9600.22968 |
| microsoft | windows_server_2016 | < 10.0.14393.8783 | 10.0.14393.8783 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.8783 | 10.0.14393.8783 |
| microsoft | windows_server_2019 | < 10.0.17763.8276 | 10.0.17763.8276 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8276 | 10.0.17763.8276 |
| microsoft | windows_server_2022 | < 10.0.20348.4648 | 10.0.20348.4648 |
| microsoft | windows_server_2022 | >= 10.0.20348.0 < 10.0.20348.4648 | 10.0.20348.4648 |
| microsoft | windows_server_2022_23h2 | < 10.0.25398.2092 | 10.0.25398.2092 |
| msrc | windows_10_version_1607 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc7.5HIGH
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Microsoft
Windows HTTP.sys Elevation of Privilege Vulnerability
vendor_msrc·2026-01-13·CVSS 7.5
CVE-2026-20929 [HIGH] CWE-284 Windows HTTP.sys Elevation of Privilege Vulnerability
Windows HTTP.sys Elevation of Privilege Vulnerability
Description: Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
FAQ: According to the CVSS metric, the attack complexity is high (AC:H). What does that mean for this vulnerability?
The Attack requires an Service Principal Name (SPN) that is registered to an account that no longer exists or is not in use, to be on the target machine.
FAQ: What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Windows HTTP.sys: Windows HTTP.sys
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;
GHSA
GHSA-cjjj-mhw7-f4xr: Improper access control in Windows HTTP
ghsa_unreviewed·2026-01-13
CVE-2026-20929 [HIGH] CWE-284 GHSA-cjjj-mhw7-f4xr: Improper access control in Windows HTTP
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: Fiber Optic Spying, Windows Rootkit, AI Vulnerability Hunting and More
blogs_hackernews·2026-04-13·CVSS 8.6
[HIGH] ⚡ Weekly Recap: Fiber Optic Spying, Windows Rootkit, AI Vulnerability Hunting and More
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## ⚡ Weekly Recap: Fiber Optic Spying, Windows Rootkit, AI Vulnerability Hunting and More
Monday is back, and the weekend’s backlog of chaos is officially hitting the fan. We are tracking a critical zero-day that has been quietly living in your PDFs for months, plus some aggressive state-sponsored meddling in infrastructure that is finally coming to light. It is one of those mornings where the gap between a quiet shift and a full-blown incident response is basically non-existent.
The variety this week is particularly nasty. We have AI models being turned into autonomous exploit engines, North Korean groups playing the long game
Bleepingcomputer
Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
blogs_bleepingcomputer·2026-01-13·CVSS 5.5
[MEDIUM] Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
## Lawrence Abrams
57 Elevation of Privilege vulnerabilities
3 Security Feature Bypass vulnerabilities
22 Remote Code Execution vulnerabilities
22 Information Disclosure vulnerabilities
2 Denial of Service vulnerabilities
5 Spoofing vulnerabilities
When BleepingComputer reports on Patch Tuesday security updates, we only count those released by Microsoft today. Therefore, the number of flaws does not include Microsoft Edge (1 flaw) and Mariner vulnerabilities fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5074109 & KB5073455 cumulative updates and Windows 10 KB5073724 extended security update .
## 3 zero-days, one ex
Wiz
CVE-2026-20929 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.5
CVE-2026-20929 [HIGH] CVE-2026-20929 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-20929 :
vulnerability analysis and mitigation
Improper access control in Windows HTTP.sys allows an authorized attacker to elevate privileges over a network.
Source : NVD
## 7.5
Score
Published January 13, 2026
Severity HIGH
CNA Score 7.5
Has Public Exploit Yes
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 13.6
Exploitation Probability (EPSS) N/A
Sources
NVD
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Crowdstrike
What is Cloud Native, Anyway?
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] What is Cloud Native, Anyway?
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STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How CrowdStrike is Accelerating Exposure Evaluation as Adversaries Gain Speed Apr 06, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand AT
Crowdstrike
CrowdStrike@ Black Hat 2020
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] CrowdStrike@ Black Hat 2020
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 2026
STARDUST CHOLLIMA Likely Compromises Axios npm Package Apr 01, 2026
Falcon for IT Supports Windows Secure Boot Certificate Lifecycle Management Apr 01, 2026
Detecting CVE-2026-20929: Kerberos Authentication Relay via CNAME Abuse Mar 31, 2026
How Charlotte AI AgentWorks Fuels Security's Agentic Ecosystem Mar 25, 2026
Video Highlights the 4 Key Steps to Successful Incident Response Dec 02, 2019
Helping Non-Security Stakeholders Understand ATT&CK in 10 Minutes or Less [VI
2026-01-13
Published