# CVE-2026-58598: Microsoft Windows Backup Engine privilege escalation

Source: https://junglewise.ai/threats/cve-2026-58598-microsoft-windows-backup-engine-privilege-escalation  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-16. Updated: 2026-07-16  
License: CC BY 4.0 with a link back

CVE-2026-58598 · Severity: high · CVSS 7 · Published 2026-07-16

A security vulnerability exists in the Windows Backup Engine, a component responsible for managing system and file backups. An attacker who already has basic access to a computer could exploit this flaw to gain full administrative control over the system. This could allow them to access sensitive data, install malicious software, or disrupt business operations.

Technologies: [Microsoft Windows 11](https://junglewise.ai/threats/technologies/windows-11), [Microsoft Windows 10](https://junglewise.ai/threats/technologies/windows-10). Vendors: [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-58598 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-58598 being exploited in the wild.

**How severe is CVE-2026-58598?** High severity, with a CVSS score of 7, published 16 July 2026.

**Which products and versions are affected?** Microsoft Windows 11 10.0.26100.0 to 10.0.26100.8875; Microsoft Windows 10 10.0.19044.0 to 10.0.19044.7548.

**Is there a fix for CVE-2026-58598?** 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-2026-58598 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-58598?** Check whether you run Microsoft Windows 11 or Microsoft Windows 10 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

A race condition (CWE-362) and potential use-after-free (CWE-416) vulnerability exists in the Windows Backup Engine due to improper synchronization during concurrent execution using shared resources. To exploit this, an attacker must first have local access to the target system with low-level user privileges. By successfully winning the race condition, the attacker can achieve elevated privileges, potentially reaching SYSTEM level. The vulnerability is tracked as CVE-2026-58598 and has been addressed in Microsoft's July 2026 security updates.

## Affected products

- Microsoft Windows 10 Version 21H2 10.0.19044.0 to 10.0.19044.7548
- Microsoft Windows 10 Version 22H2 All versions affected
- Microsoft Windows 11 Version 24H2 10.0.26100.0 to 10.0.26100.8875
- Microsoft Windows 11 Version 25H2 10.0.26200.0 to 10.0.26100.8875
- Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2525

## Timeline

- 2026-07-16: disclosed
- 2026-07-16: advisory

## References

- [https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58598](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58598)

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- [Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.](https://junglewise.ai/threats/cve-2026-68820-microsoft-windows-ancillary-function-driver-for-winsock-use-after)
- [Microsoft Windows Boot Loader security feature bypass](https://junglewise.ai/threats/cve-2026-58638-microsoft-windows-boot-loader-security-feature-bypass)
- [Microsoft Windows Client-Side Caching Service privilege escalation](https://junglewise.ai/threats/cve-2026-58637-microsoft-windows-client-side-caching-service-privilege)
- [Microsoft Windows Desktop Window Manager privilege escalation](https://junglewise.ai/threats/cve-2026-58634-microsoft-windows-desktop-window-manager-privilege-escalation)