CVE-2026-26128
published 2026-03-10CVE-2026-26128: Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
PriorityP349high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.45%
36.1th percentile
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
Affected
43 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1607 | < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_10_1809 | < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_10_21h2 | < 10.0.19044.7058 | 10.0.19044.7058 |
| microsoft | windows_10_22h2 | < 10.0.19045.7058 | 10.0.19045.7058 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_10_version_21h2 | >= 10.0.19044.0 < 10.0.19044.7058 | 10.0.19044.7058 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.7058 | 10.0.19045.7058 |
| microsoft | windows_11_23h2 | < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_24h2 | < 10.0.26100.7979 | 10.0.26100.7979 |
| microsoft | windows_11_25h2 | < 10.0.26200.7979 | 10.0.26200.7979 |
| microsoft | windows_11_26h1 | < 10.0.28000.1719 | 10.0.28000.1719 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.6783 | 10.0.22631.6783 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.8037 | 10.0.26100.8037 |
| microsoft | windows_11_version_25h2 | >= 10.0.26200.0 < 10.0.26200.8037 | 10.0.26200.8037 |
| microsoft | windows_11_version_26h1 | >= 10.0.28000.0 < 10.0.28000.1719 | 10.0.28000.1719 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25973 | 6.2.9200.25973 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.23074 | 6.3.9600.23074 |
| microsoft | windows_server_2016 | < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_server_2016 | >= 10.0.14393.0 < 10.0.14393.8957 | 10.0.14393.8957 |
| microsoft | windows_server_2019 | < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_server_2019 | >= 10.0.17763.0 < 10.0.17763.8511 | 10.0.17763.8511 |
| microsoft | windows_server_2022 | < 10.0.20348.4830 | 10.0.20348.4830 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_msrc7.8HIGH
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Microsoft
Windows SMB Server Elevation of Privilege Vulnerability
vendor_msrc·2026-03-10·CVSS 7.8
CVE-2026-26128 [HIGH] CWE-287 Windows SMB Server Elevation of Privilege Vulnerability
Windows SMB Server Elevation of Privilege Vulnerability
Description: Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
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 SMB Server: Windows SMB Server
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5078752
Reference: https://support.microsoft.com/help/5078752
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB
GHSA
GHSA-x7g8-668h-5f2w: Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally
ghsa_unreviewed·2026-03-10
CVE-2026-26128 [HIGH] CWE-287 GHSA-x7g8-668h-5f2w: Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
No detection rules found.
No public exploits indexed.
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos·2026-03-13
March Patch Tuesday visits 15 product families
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Talos
Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-03-10·CVSS 8.8
CVE-2026-26110 [HIGH] Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for March 2026 which includes 79 vulnerabilities, including three that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.” Microsoft assessed that exploitation of the three “critical” vulnerabilities is “less likely.”
CVE-2026-26110 and CVE-2026-26113 are “critical” Microsoft Office Remote Code Execution Vulnerabilities that could allow an unauthorized attacker to execute code locally; the former is a type confusion issue caused by access to a resource using an incompatible type, and the latter is an untrusted pointer dereference.
CVE-2026-26144 is a “critical” information disclosure vulnerability affecting Microsoft Excel. This vulnerability is due to improper neutralization of input in Mi
Talos
Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities
blogs_talos·2026-03-10·CVSS 8.8
CVE-2026-26110 [HIGH] Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities
## Microsoft Patch Tuesday for March 2026 — Snort rules and prominent vulnerabilities
Microsoft has released its monthly security update for March 2026 which includes 79 vulnerabilities, including three that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.” Microsoft assessed that exploitation of the three “critical” vulnerabilities is “less likely.”
CVE-2026-26110 and CVE-2026-26113 are “critical” Microsoft Office Remote Code Execution Vulnerabilities that could allow an unauthorized attacker to execute code locally; the former is a type confusion issue caused by access to a resource using an incompatible type, and the latter is an untrusted pointer dereference.
CVE-2026-26144 is a “critical” information disclosure vulnerability affecti
Bleepingcomputer
Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
blogs_bleepingcomputer·2026-03-10·CVSS 8.8
[HIGH] Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Microsoft March 2026 Patch Tuesday fixes 2 zero-days, 79 flaws
## Lawrence Abrams
The number of bugs in each vulnerability category is listed below:
46 Elevation of Privilege Vulnerabilities
2 Security Feature Bypass Vulnerabilities
18 Remote Code Execution Vulnerabilities
10 Information Disclosure Vulnerabilities
4 Denial of Service Vulnerabilities
4 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 9 Microsoft Edge flaws, Mariner, Payment Orchestrator Service, Azure, and Microsoft Devices Pricing Program flaws fixed earlier this month.
To learn more about the non-security updates released today, you can review our dedicated articles on the
Sophos
March Patch Tuesday visits 15 product families
blogs_sophos
March Patch Tuesday visits 15 product families
Share This
Microsoft on Tuesday released 84 patches affecting 15 product families – including a few you’ve possibly never encountered. Eight of the addressed issues are considered by Microsoft to be of Critical severity, though none of those affect Windows, nor are they expected to be exploited within the next 30 days. In addition, five of those Critical issues were in fact addressed by Microsoft in advance of Patch Tuesday itself, as we’ll discuss below. Twenty-two have a CVSS base score of 8.0 or higher, including one with a 9.8 base score. None are known to be under active exploit in the wild, but two are publicly disclosed so far.
At patch time, six CVEs are judged more likely to be exploited in the next 30 days by the company’s estimation. Various of this month’s issues are amenable
Wiz
CVE-2026-26128 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 7.8
CVE-2026-26128 [HIGH] CVE-2026-26128 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-26128 :
vulnerability analysis and mitigation
Improper authentication in Windows SMB Server allows an authorized attacker to elevate privileges locally.
Source : NVD
## 7.8
Score
Published March 10, 2026
Severity HIGH
CNA Score 7.8
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 13.8
Exploitation Probability (EPSS) N/A
Sources
NVD
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https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26128https://www.vicarius.io/vsociety/posts/cve-2026-26128-detection-script-improper-authentication-in-windows-smb-serverhttps://www.vicarius.io/vsociety/posts/cve-2026-26128-mitigation-script-improper-authentication-in-windows-smb-server
2026-03-10
Published