CVE-2026-83507Windows Update Orchestrator Service Information Disclosure Vulnerability
- 5.5MediumCVSS base score
- 0.50%Exploitation in 30 daysEPSS · top 57% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
Improper link resolution before file access ('link following') in Windows Update Orchestrator Service allows an authorized attacker to disclose information locally.
Timeline
ID reserved
By microsoft
- 43 days later
· 43 days later
Published
- 28 days later
· 28 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| microsoftCNA (assigner) | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C |
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.50% · top 57% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
Microsoft · Windows 10 Version 21H2
- affected 10.0.19044.0 – < 10.0.19044.7807
Microsoft · Windows 10 Version 22H2
- affected 10.0.19045.0 – < 10.0.19045.7807
Microsoft · Windows 11 version 23H2
- affected 10.0.22631.0 – < 10.0.22631.7652
Microsoft · Windows 11 Version 23H2
- affected 10.0.22631.0 – < 10.0.22631.7652
Microsoft · Windows 11 Version 24H2
- affected 10.0.26100.0 – < 10.0.26100.9711
Microsoft · Windows 11 Version 25H2
- affected 10.0.26200.0 – < 10.0.26200.9711
Microsoft · Windows 11 version 26H1
- affected 10.0.28000.0 – < 10.0.28000.3231
Microsoft · Windows 11 Version 26H2
- affected 10.0.26300.0 – < 10.0.26300.9711
Microsoft · Windows Server 2022
- affected 10.0.20348.0 – < 10.0.20348.5761
Microsoft · Windows Server 2025
- affected 10.0.26100.0 – < 10.0.26100.33650
Microsoft · Windows Server 2025 (Server Core installation)
- affected 10.0.26100.0 – < 10.0.26100.33650
References
References1
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-99905 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-83507)Record last updated .