Vulnerability Report

CVE-2026-20849

Title: Reliance on untrusted inputs in a security decision in Windows Kerberos

XSS

Proof Of Concept

No public PoC currently indexed for CVE-2026-20849.

CWE Category CWE-807

Published Date Jan 13, 2026

Modified Date Jan 15, 2026

Exploit Status Not Found

Score 7.5 CVSS v3.1

Exploit Probability (EPSS)

0.97%

Vulnerability Summary

CVE-2026-20849: Reliance on untrusted inputs in a security decision in Windows Kerberos allows an authorized attacker to elevate privileges over a network.

Impacted Vendors

microsoft 14

Reference Links

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20849

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.5

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-20849 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

January 15, 2026 MODIFIED

Vulnerability data updated via NVD.

January 15, 2026 MODIFIED

Vulnerability data updated via NVD.

January 14, 2026 MODIFIED

Vulnerability data updated via NVD.

January 13, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK

Complexity HIGH

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.