CVE-2019-1126 json
A security feature bypass vulnerability exists in Active Directory Federation Services (ADFS) which could allow an attacker to bypass the e…
published 2019-07-15 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-9703
- cvss
- 5.3
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.9%
- EPSS 4.9% chance of exploitation in 30 days, percentile 92%
- public exploits
- 0
- none known
Summary
A security feature bypass vulnerability exists in Active Directory Federation Services (ADFS) which could allow an attacker to bypass the extranet lockout policy.To exploit this vulnerability, an attacker could run a specially crafted application, which would allow an attacker to launch a password brute-force attack or cause account lockouts in Active Directory.This security update corrects how ADFS handles external authentication requests., aka 'ADFS Security Feature Bypass Vulnerability'. This CVE ID is unique from CVE-2019-0975.
Patch / fix
Exploit prediction
4.95% chance of exploitation in the next 30 days, higher than 92% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 5.3 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected products
- Microsoft Windows Server
- Microsoft Windows Server, version 1903 (Server Core installation)
Classification
- Weakness
-
- CWE-307 Improper Restriction of Excessive Authentication Attempts
References
-
portal.msrc.microsoft.com
/en-US/security-guidance/advisory/CVE-2019-1126
patch, vendor-advisory
Sources
- CVE List CVE-2019-1126
- NVD CVE-2019-1126
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