CVE-2021-26863: microsoft windows_10 Improper Privilege Management
CVSS: 7.2v2.0HighModified
Published 11-03-2021Last modified 19-08-2026
Vulnerability summary
CVE-2021-26863 is a high (CVSS 7.2) Improper Privilege Management vulnerability in microsoft windows_10. EPSS estimates a 11.94% chance of exploitation in the next 30 days, higher than 96.1% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
7.2/10
010
High · v2.0 (NVD)EPSS score
11.94%
0%100%
Medium · +0.09 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 11-03-2021PublishedVulnerability first disclosed.
- 19-08-2026Last modifiedVulnerability information updated.
Description
Windows Win32k Elevation of Privilege Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.0Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
High 7.2Preferred score · NVD (NIST)
AV:L/AC:L/Au:N/C:C/I:C/A:CSourcesSingle source
EPSS trend
Probability
11.94%
Chance of exploitation in the next 30 days
Percentile
96%
Versus all other CVEs
30-day change
+0.09 pp
From 11.85% on 21-09-2026
21-09-202621-10-2026
EPSS score11.94%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (packetstormsecurity.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Microsoft12 products
- windows_1020h2 | 1803 | 1809 | 1909 | 2004
- windows 10 version 1803≥ 10.0.0, < 10.0.17134.2087
- windows 10 version 1809≥ 10.0.17763.0, < 10.0.17763.1817 | ≥ 10.0.0, < 10.0.17763.1817
- windows 10 version 1909≥ 10.0.0, < 10.0.18363.1440
- windows 10 version 2004≥ 10.0.0, < 10.0.19043.867
1 vendor · 12 products
References
3 links
- portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26863X Refsource MISCX TransferredPatchVendor Advisory