What is CVE-2026-21262?
Improper access control in SQL Server allows an authorized attacker to elevate privileges over a network.
The record classifies CVE-2026-21262 under weakness class CWE-284. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 5 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 247 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS (FIRST)
- 2.0% probability of exploitation in the next 30 days, higher than 80.9% of all scored CVEs
- CISA KEV
- Not listed in the CISA Known Exploited Vulnerabilities catalog
- Threadlinqs priority
- 7.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- Published
- 2026-03-10
Is CVE-2026-21262 being exploited?
It currently carries a trending score of 25 in the Threadlinqs vulnerability feed.
Affected products and versions
- Microsoft: Sql Server 2016, Sql Server 2017, Sql Server 2019, Sql Server 2022, Sql Server 2025
How to fix CVE-2026-21262
The record marks a vendor fix as available for CVE-2026-21262. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21262. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.
Threat activity tracking CVE-2026-21262
2 tracked threats in the Threadlinqs corpus reference CVE-2026-21262, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS.