# CVE-2026-69680: Microsoft Windows DNS origin validation bypass

Source: https://junglewise.ai/threats/cve-2026-69680-microsoft-windows-dns-origin-validation-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-2026-69680 · Severity: high · CVSS 8.1 · Published 2026-09-08

Windows DNS Server is vulnerable to a validation error that allows attackers to forge DNS responses and redirect network traffic to malicious servers. An attacker can intercept DNS queries and inject spoofed responses to compromise the integrity of name resolution, potentially redirecting users to phishing sites or malware distribution points without authentication.

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

## Quick answers

**Is CVE-2026-69680 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69680 being exploited in the wild.

**How severe is CVE-2026-69680?** High severity, with a CVSS score of 8.1, published 8 September 2026.

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

**Is there a fix for CVE-2026-69680?** 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-2026-69680 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-69680?** Check whether you run Microsoft Windows DNS Server 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 an origin validation error in Windows DNS Server that fails to properly validate the source of DNS responses. The flaw allows network-based attackers to perform DNS spoofing attacks by crafting malicious DNS responses that bypass origin authentication checks. An attacker positioned on the network can intercept and respond to DNS queries faster than legitimate DNS servers, or exploit timing windows to inject spoofed responses. This enables redirection of traffic to attacker-controlled servers, potentially facilitating phishing, malware distribution, or man-in-the-middle attacks. Microsoft has released security updates to address this validation bypass.

## Affected products

- Microsoft Windows DNS Server <UNKNOWN>

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69680](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69680)

## Related threats

- [Microsoft Windows DNS out-of-bounds read](https://junglewise.ai/threats/cve-2026-97006-out-of-bounds-read-in-windows-dns-allows-an-authorized-attacker)
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- [Microsoft Windows DNS Server use-after-free denial of service](https://junglewise.ai/threats/cve-2026-96017-use-after-free-in-dns-server-allows-an-authorized-attacker-to)
- [Microsoft Windows DNS Server improper input validation spoofing](https://junglewise.ai/threats/cve-2026-119905-improper-input-validation-in-windows-dns-allows-an-authorized)
- [Windows DNS integer overflow in message parsing](https://junglewise.ai/threats/cve-2026-105579-integer-overflow-or-wraparound-in-windows-dns-allows-an)