CVE-2026-84009
Time-of-check time-of-use (toctou) race condition in Windows Projected File System allows an…
- Risk score
- 40/100
- CVSS
- 4.7 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 13 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- Time-of-check time-of-use (toctou) race condition in Windows Projected File System allows an authorized attacker to perform tampering locally.
- Affected
- Microsoft Windows 10 1809
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Microsoft Windows 10 1809: Red, act today. Heap-based buffer overflow in Windows Text Shaping allows an unauthorized attacker to execute code over a network.
The flaws
- CVE-2026-84009: Time-of-check time-of-use (toctou) race condition in Windows Projected File System allows an… (CVSS 4.7 · EPSS 0%)
- CVE-2026-102210: Heap buffer overflow (CVSS 9.8 · EPSS 1%)
- CVE-2026-87716: Heap buffer overflow (CVSS 7.5 · EPSS 1%)
- CVE-2026-70104: Untrusted pointer dereference in Windows Win32 Kernel Subsystem allows an authorized attacker to… (CVSS 7.8 · EPSS 0%)
The fix
Fix: Apply the vendor's security update; see the linked advisory.
Who is exposed: Microsoft Windows 10 1809
Where it stands
- No known exploitation
Connects to
- Same weakness: CWE-367 (CWE-367). 47 other warnings in 30 days
- Same product: Earlier Microsoft Windows 10 1809 warnings. 62 in the last 90 days
Why it is Yellow
- CVSS 4.7 medium
- On your watchlist: windows server
References
Original description
Time-of-check time-of-use (toctou) race condition in Windows Projected File System allows an authorized attacker to perform tampering locally.
Last activity 13 Oct 2026. Patch Forecast updates every hour.