What is CVE-2026-55899?
This critical vulnerability allows unauthorized network-based attackers to bypass authentication mechanisms in Microsoft SharePoint, gaining access to the system. Organizations should immediately apply the security update released by Microsoft and implement additional monitoring for their Active Directory environments.
Azərbaycanca: Bu kritik zəiflik Microsoft SharePoint məhsulunda şəbəkə üzərindən autentifikasiya mexanizmini keçərək icazəsiz giriş əldə etməyə imkan verir. Təşkilatlar Microsoft tərəfindən buraxılmış təhlükəsizlik yeniləməsini dərhal tətbiq etməli və Active Directory mühitlərini əlavə monitorinq etməlidir.
Related CVEs
link basis: same weakness class CWE-287; shared vendor: Microsoft
FAQ2
Which product is affected by CVE-2026-55899?
This critical vulnerability affects Microsoft SharePoint.
What should organizations do to protect against this vulnerability?
Organizations should immediately apply the security update released by Microsoft and implement additional monitoring for their Active Directory environments.
See also6
This explainer is AI-written from source data — skopnix's own reporting on this CVE; CVSS scores, vendors and versions are never invented. See NVD for the official record.