Is CVE-2026-58529 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-58529 being exploited in the wild.

How severe is CVE-2026-58529?

High severity, with a CVSS score of 7.1, published 14 July 2026.

Which products and versions are affected?

Microsoft Windows 11 10.0.28000.0 to 10.0.28000.2525.

Is there a fix for CVE-2026-58529?

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-2026-58529 attacked?

It is attacked over the network, in an operating system.

Am I affected by CVE-2026-58529?

Check whether you run Microsoft Windows 11 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.

CVE-2026-58529: Microsoft AD FS out-of-bounds read information disclosure

CVE-2026-58529 · Severity: high · CVSS 7.1 · Published 2026-07-14

Microsoft Active Directory Federation Services (AD FS), a component used to provide single sign-on access to applications, contains a security vulnerability. An authorized user on the network could exploit this flaw to view sensitive information that they should not have access to. This could lead to the disclosure of internal system data or user credentials, potentially aiding further attacks against the organization's identity infrastructure.

Technologies: Microsoft Windows 11. Vendors: Microsoft.

Quick answers

Is CVE-2026-58529 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-58529 being exploited in the wild.
How severe is CVE-2026-58529?: High severity, with a CVSS score of 7.1, published 14 July 2026.
Which products and versions are affected?: Microsoft Windows 11 10.0.28000.0 to 10.0.28000.2525.
Is there a fix for CVE-2026-58529?: 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-2026-58529 attacked?: It is attacked over the network, in an operating system.
Am I affected by CVE-2026-58529?: Check whether you run Microsoft Windows 11 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

An out-of-bounds read vulnerability (CWE-125) exists in Active Directory Federation Services (AD FS). The flaw is triggered when the component improperly handles memory buffers during network requests. An attacker with basic user privileges (PR:L) can exploit this over the network without user interaction to read data beyond the intended buffer. This can result in the disclosure of sensitive information from the process memory. Microsoft has released updates to address this issue in affected versions of Windows 11.

Affected products

Microsoft Windows 11 version 26H1 10.0.28000.0 to 10.0.28000.2525

Timeline

2026-07-14: advisory
2026-07-14: disclosed

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58529

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