RCE in Windows Active Directory; core infrastructure used across industries; could disrupt domains.
CVE-2026-33826
RCE in Windows Active Directory via adjacent network due to input validation flaw.
Is CVE-2026-33826 being exploited?
Not confirmed. CVE-2026-33826 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 0.53% probability of exploitation in the next 30 days.
How severe is CVE-2026-33826?
CVE-2026-33826 is rated High with a CVSS score of 8.0. 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-2026-33826?
Yes. A fix has been recorded for CVE-2026-33826. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-33826 affect?
CVE-2026-33826 affects Windows Server Active Directory, Domain controllers, AD-related services. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-33826?
Patch Windows AD; apply vendor security updates.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can execute arbitrary code on domain-joined hosts across the network.
Immediate action required
- affected>= 6.3.9600.0 and < 6.3.9600.23132
- affected>= 6.3.9600.0 and < 6.3.9600.23132
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.14393.0 and < 10.0.14393.9060
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.17763.0 and < 10.0.17763.8644
- affected>= 10.0.20348.0 and < 10.0.20348.5020
- affected>= 10.0.25398.0 and < 10.0.25398.2274
- affected>= 10.0.26100.0 and < 10.0.26100.32690
- affected>= 10.0.26100.0 and < 10.0.26100.32690
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.