Affects Microsoft SQL Server, a widely deployed enterprise database; remote privilege escalation in this product is broadly impactful and likely to make cybersecurity news.
CVE-2026-66813
SQL Server out-of-bounds read enables remote privilege escalation.
Is CVE-2026-66813 being exploited?
Not confirmed. CVE-2026-66813 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.72% probability of exploitation in the next 30 days.
How severe is CVE-2026-66813?
CVE-2026-66813 is rated High with a CVSS score of 8.1. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-66813?
Yes. A fix has been recorded for CVE-2026-66813. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-66813 affect?
CVE-2026-66813 affects Microsoft SQL Server. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-66813?
Install Microsoft SQL Server security update immediately; restrict DB network access until patched.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote OOB read can be exploited to elevate privileges on SQL Server, allowing access/modify of databases and execution of higher-privilege actions.
Patch when possible
- affected>= 14.0.3006.16 and < 14.0.3570.2
- affected>= 14.0.0 and < 14.0.2150.2
- affected>= 15.0.4003.23 and < 15.0.4510.2
- affected>= 15.0.0 and < 15.0.2210.4
- affected>= 16.0.4003.1 and < 16.0.4315.2
- affected>= 16.0.0 and < 16.0.1220.3
- affected>= 17.0.4006.0 and < 17.0.5045.3
- affected>= 17.0.1050.2 and < 17.0.1155.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.
cisa ssvc
- exploitation
- none
- automatable
- no
- technical impact
- total
Assessed by CISA 11 Nov 2026 (SSVC 2.0.3).
timeline
- 10 Nov 2026Published
- 11 Nov 2026CISA SSVC assessment: exploitation none · same day later
- 11 Nov 2026CVE record last updated · 1 day later
- 12 Nov 2026Analysed by vulneraibility.com · 1 day later
- Patchmsrc.microsoft.com /update-guide/vulnerability/CVE-2026-66813
sources
- CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
- NVD: CVSS and CPE data
- CISA Vulnrichment (ADP): SSVC decision points
- FIRST EPSS: exploit probability and percentile
- Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.