CVE-2026-21262 is a high-severity improper access control vulnerability (CVSS 8.8) affecting Microsoft SQL Server versions 2016 through 2025. It allows an authorized attacker with low privileges to remotely elevate their access over the network with low complexity. This can lead to a complete compromise of confidentiality, integrity, and availability of the affected SQL Server instance. While there is no public exploit code or evidence of active exploitation, the vulnerability has received notable community and media attention, with some outlets describing it as a critical zero-day.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 13.0.6300.2, < 13.0.6480.4CPE matchmatch criteria | cpe:2.3:a:microsoft:sql_server_2016:*:*:*:*:*:*:x64:* | ||
>= 13.0.7000.253, < 13.0.7075.5CPE matchmatch criteria | cpe:2.3:a:microsoft:sql_server_2016:*:*:*:*:*:*:x64:* | ||
>= 14.0.1000.169, < 14.0.2100.4CPE matchmatch criteria | cpe:2.3:a:microsoft:sql_server_2017:*:*:*:*:*:*:x64:* | ||
>= 14.0.3006.16, < 14.0.3520.4CPE matchmatch criteria | cpe:2.3:a:microsoft:sql_server_2017:*:*:*:*:*:*:x64:* | ||
>= 15.0.2000.5, < 15.0.2160.4CPE matchmatch criteria | cpe:2.3:a:microsoft:sql_server_2019:*:*:*:*:*:*:x64:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.