# CVE-2026-69676: Microsoft Windows Kerberos authentication bypass

Source: https://junglewise.ai/threats/cve-2026-69676-microsoft-windows-kerberos-authentication-bypass  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-08. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-69676 · Severity: high · CVSS 8.8 · Published 2026-09-08

Windows Kerberos is the core authentication system used by Microsoft Active Directory to verify user and computer identities across enterprise networks. An authenticated attacker can bypass Kerberos security checks through capture-replay attacks, allowing them to execute arbitrary code on networked systems. This could enable lateral movement within an organization or privilege escalation on domain-joined computers.

Technologies: [Microsoft Windows Kerberos](https://junglewise.ai/threats/technologies/windows-kerberos). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-69676 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69676 being exploited in the wild.

**How severe is CVE-2026-69676?** High severity, with a CVSS score of 8.8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows Kerberos <UNKNOWN>.

**Is there a fix for CVE-2026-69676?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-69676 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-69676?** Check whether you run Microsoft Windows Kerberos at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This vulnerability is a capture-replay authentication bypass in the Windows Kerberos implementation. An authorized attacker on the network can intercept and replay Kerberos tokens to bypass authentication checks and gain unauthorized code execution capabilities. The attack requires network access and an existing authenticated context on the domain. Microsoft has released security patches to address this vulnerability; affected systems should be updated immediately to prevent exploitation.

## Affected products

- Microsoft Windows Kerberos <UNKNOWN>

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69676](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69676)

## Related threats

- [Windows Kerberos use-after-free privilege escalation](https://junglewise.ai/threats/cve-2026-70241-use-after-free-in-windows-kerberos-allows-an-authorized-attacker)
- [Microsoft Windows Kerberos integer overflow remote code execution](https://junglewise.ai/threats/cve-2026-47288-microsoft-windows-kerberos-integer-overflow-remote-code-execution)
- [Microsoft Windows Kerberos null pointer dereference denial of service](https://junglewise.ai/threats/cve-2026-42903-microsoft-windows-kerberos-null-pointer-dereference-denial-of)