Improper Authentication in Microsoft Defender for Identity
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2025-26685 |
| CWE-ID | CWE-287 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software |
Microsoft Defender for Identity Client/Desktop applications / Antivirus software/Personal firewalls |
| Vendor | Microsoft |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Improper Authentication
EUVDB-ID: #VU109096
Risk: Medium
CVSSv4.0: 4.9 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]
CVE-ID: CVE-2025-26685
CWE-ID:
CWE-287 - Improper Authentication
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to an error when processing authentication requests in Microsoft Defender for Identity. A remote attacker on the local network can bypass authentication process and perform spoofing attack.
MitigationInstall updates from vendor's website.
Vulnerable software versionsMicrosoft Defender for Identity: All versions
CPE2.3 External linkshttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-26685
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
