CVE-2026-81963
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
7.8
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.6%
48.8th percentile
CISA KEV
Listed
Added 2026-09-08 · patch by 2026-09-22
Weakness / dates
CWE-59
Published 2026-09-08 · modified 2026-09-09
CVSS breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | L | Local |
| Attack Complexity | L | Low |
| Privileges Required | L | Low |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2026-09-08 — Published (NVD)
- 2026-09-08 — Added to CISA KEV (actively exploited)
- 2026-09-22 — CISA patch-by deadline
- 2026-09-09 — Last modified (NVD)
Description
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.