Remote code execution in a Microsoft Windows server component (Work Folders); high-impact RCE in widely deployed enterprise OS.
CVE-2026-71336
Authenticated RCE via integer overflow in Windows Work Folders.
Is CVE-2026-71336 being exploited?
Not confirmed. CVE-2026-71336 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 0.85% probability of exploitation in the next 30 days.
How severe is CVE-2026-71336?
CVE-2026-71336 is rated High with a CVSS score of 8.8. 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-2026-71336?
Yes. A fix has been recorded for CVE-2026-71336. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-71336 affect?
CVE-2026-71336 affects Microsoft Windows Server (Work Folders service). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-71336?
Apply Microsoft security update to affected servers immediately.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated network attacker can trigger an integer overflow in Work Folders to achieve remote code execution on affected Windows servers.
Immediate action required
- affected>= 10.0.14393.0 and < 10.0.14393.9512
- affected>= 10.0.17763.0 and < 10.0.17763.9245
- affected>= 6.3.9600.0 and < 6.3.9600.23397
- affected>= 6.3.9600.0 and < 6.3.9600.23397
- affected>= 10.0.14393.0 and < 10.0.14393.9512
- affected>= 10.0.14393.0 and < 10.0.14393.9512
- affected>= 10.0.17763.0 and < 10.0.17763.9245
- affected>= 10.0.17763.0 and < 10.0.17763.9245
- affected>= 10.0.20348.0 and < 10.0.20348.5622
- affected>= 10.0.26100.0 and < 10.0.26100.33438
- affected>= 10.0.26100.0 and < 10.0.26100.33438
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.