Windows Kerberos CVE-2026-69676

The attacker must hold at least a low-privilege domain credential (PR:L) to operate within the Kerberos realm and initiate ticket requests. Successful exploitation further requires network positioning to capture Kerberos authentication messages in transit - such as a man-in-the-middle position, access to network packet captures, or exploitation of a shared network segment. The flaw affects default Windows Active Directory deployments; no non-standard configuration is required to be vulnerable. Exploitation is limited by the need for an existing domain credential and the practical requirement for network-layer access to Kerberos traffic. Environments that enforce Kerberos armoring (FAST) or restrict lateral Kerberos traffic may have reduced exposure.

The provided CVSS 8.8 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) reflects network-accessible exploitation requiring only low-level prior authorization, with full confidentiality, integrity, and availability impact. In practice, capture-replay attacks against Kerberos require the adversary to be in a position to intercept network authentication traffic - either via a man-in-the-middle position, ARP spoofing, or access to captured packet data - which introduces a practical complexity the AC:L rating may understate. No public exploit code has been identified and this CVE does not appear in the CISA KEV catalog at time of analysis, reducing the immediate exploitation pressure somewhat. However, the ubiquitous deployment of Windows Active Directory means the potential blast radius is enormous; even a mid-sized municipal IT team in sanok should treat this as urgent patching given that Kerberos ticket capture is a well-understood attacker technique documented in frameworks such as MITRE ATT&CK (T1558). The authorized-attacker prerequisite (PR:L) still requires an adversary to hold some domain credential, which is a meaningful but not unusual barrier in post-initial-compromise scenarios.

An adversary with a low-privilege domain account positions themselves on the network segment to capture Kerberos authentication traffic - for example, via ARP cache poisoning between a workstation and a domain controller. After capturing a valid Kerberos service ticket for a higher-privileged principal, the attacker replays it to authenticate to a target service as that principal and executes code in that security context. No public proof-of-concept has been identified, but Kerberos ticket interception and replay are well-documented techniques (MITRE ATT&CK T1558) with existing tooling in penetration testing frameworks.