VDB
CVE-2026-20812
CVE-2026-20812
PUBLISHED
CVSS 6.5 MEDIUM
LDAP Tampering Vulnerability
Reported by microsoft · Published January 13, 2026
Improper input validation in Windows LDAP - Lightweight Directory Access Protocol allows an authorized attacker to perform tampering over a network.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| Windows 11 Version 23H2 | Microsoft | 10.0.22631.6491 |
| windows_10_22H2 | microsoft | 10.0.19045.6809 |
| Windows Server 2022, 23H2 Edition (Server Core installation) | Microsoft | 10.0.25398.2092 |
| windows_10_1809 | microsoft | 10.0.17763.8276 |
| Windows Server 2025 | Microsoft | 10.0.26100.32230 |
Risk scores
CVSS 3.1
6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19044.0 |
| Microsoft | Windows 10 Version 22H2 | 10.0.19045.0 |
| Microsoft | Windows 11 version 23H2 | 10.0.22631.0 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 |
| Microsoft | Windows 11 Version 24H2 | 10.0.26100.0 |
| Microsoft | Windows 11 Version 25H2 | 10.0.26200.0 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 |
| Microsoft | Windows Server 2025 (Server Core installation) | 10.0.26100.0 |
| Microsoft | Windows 11 Version 23H2 | 10.0.22631.0 |
| Microsoft | Windows Server 2022, 23H2 Edition (Server Core installation) | 10.0.25398.0 |
| Microsoft | Windows Server 2025 | 10.0.26100.0 |
| microsoft | windows_10_1607 | 10.0.14393.0 |
…and 24 more
Timeline
- Jan 13, 2026 CVE Published
- Jan 13, 2026 PoC Published (3 in total, the first dated here)
- Jan 14, 2026 EPSS Score (30 in total, the first dated here)
- Mar 3, 2026 Security Advisory (6 in total, the first dated here)
- Mar 25, 2026 Coalition ESS Score (2 in total, the first dated here)
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-20812
vulnetix vdb fixes CVE-2026-20812Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-20812/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart
References
- LDAP Tampering Vulnerability vendor-advisorypatch