# CVE-2026-69505: Microsoft Windows NTFS out-of-bounds read privilege escalation

Source: https://junglewise.ai/threats/cve-2026-69505-microsoft-windows-ntfs-out-of-bounds-read-privilege-escalation  
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-2026-69505 · Severity: high · CVSS 8 · Published 2026-09-08

Windows NTFS, the core file system used by Windows, contains an out-of-bounds memory read vulnerability that an authenticated network user can exploit to gain elevated system privileges. An attacker with valid credentials on a network-connected system could leverage this flaw to escalate from a standard user account to administrative access, potentially enabling further compromise of the system.

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

## Quick answers

**Is CVE-2026-69505 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-69505 being exploited in the wild.

**How severe is CVE-2026-69505?** High severity, with a CVSS score of 8, published 8 September 2026.

**Which products and versions are affected?** Microsoft Windows NTFS.

**Is there a fix for CVE-2026-69505?** 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-2026-69505 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-69505?** Check whether you run Microsoft Windows NTFS. 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

An out-of-bounds read vulnerability exists in the Windows NTFS file system driver, allowing an authenticated attacker to read memory beyond allocated boundaries. The vulnerability can be triggered over the network by an authorized user with valid credentials. Successful exploitation enables privilege escalation from a standard user context to system/administrator level. The attack requires network access and valid authentication credentials. Microsoft has issued security updates to remediate this vulnerability.

## Affected products

- Microsoft Windows NTFS

## Timeline

- 2026-09-08: disclosed

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69505](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69505)

## Related threats

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- [Windows NTFS improper access control information disclosure](https://junglewise.ai/threats/cve-2026-83864-improper-access-control-in-windows-ntfs-allows-an-authorized)
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- [Windows NTFS out-of-bounds read privilege escalation](https://junglewise.ai/threats/cve-2026-83508-out-of-bounds-read-in-windows-ntfs-allows-an-authorized-attacker)
- [Windows NTFS integer overflow allows privilege escalation](https://junglewise.ai/threats/cve-2026-69916-integer-overflow-or-wraparound-in-windows-ntfs-allows-an)