CVE-2026-21253
HIGH EPSS 50.9%
Published Feb 10, 20264mo ago · Modified Jun 17, 20262w ago
7.0 CVSS 3.1
Published Feb 10, 2026 4mo ago
Last Modified Jun 17, 2026 2w ago
Description
Use after free in Mailslot File System allows an authorized attacker to elevate privileges locally.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
50.9% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-416 Use After Free Memory Safety
Affected Products 23
| Vendor | Product | Version | Range |
|---|---|---|---|
| microsoft | windows_10_1607 | * | <10.0.14393.8868 |
| microsoft | windows_10_1607 | * | <10.0.14393.8868 |
| microsoft | windows_10_1809 | * | <10.0.17763.8389 |
| microsoft | windows_10_1809 | * | <10.0.17763.8389 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_21h2 | * | <10.0.19044.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_10_22h2 | * | <10.0.19045.6937 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_23h2 | * | <10.0.22631.6649 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_24h2 | * | <10.0.26100.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_11_25h2 | * | <10.0.26200.7781 |
| microsoft | windows_server_2012 | * | any |
| microsoft | windows_server_2012 | r2 | any |
| microsoft | windows_server_2016 | * | <10.0.14393.8868 |
| microsoft | windows_server_2019 | * | <10.0.17763.8389 |
| microsoft | windows_server_2022 | * | <10.0.20348.4711 |
| microsoft | windows_server_2022_23h2 | * | <10.0.25398.2149 |
| microsoft | windows_server_2025 | * | <10.0.26100.32313 |
References 3
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21253
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-21253-detection-script-elevation-of-privilege-vulnerability-in-mailslot-file-system
- vicarius.io https://www.vicarius.io/vsociety/posts/cve-2026-21253-mitigation-script-elevation-of-privilege-vulnerability-in-mailslot-file-system
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.