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CVE-2026-58529 Microsoft CVE debrief

CVE-2026-58529 is a HIGH severity vulnerability with a CVSS score of 7.1. The vulnerability is an out-of-bounds read in Active Directory Federation Services (AD FS) that allows an authorized attacker to disclose information over a network. This type of vulnerability can lead to unauthorized disclosure of sensitive information. System administrators and security teams should review AD FS configurations and ensure secure settings are in place.

Vendor
Microsoft
Product
Windows 11 version 26H1
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

System administrators and security teams responsible for Active Directory Federation Services (AD FS) should be aware of this vulnerability and take necessary actions to mitigate it. This includes reviewing AD FS configurations, ensuring secure settings are in place, and monitoring for suspicious activity.

Technical summary

The vulnerability is caused by an out-of-bounds read in Active Directory Federation Services (AD FS). An authorized attacker can exploit this vulnerability to disclose information over a network. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L. Affected product deployments should be reviewed for exposure.

Defensive priority

High priority should be given to patching or mitigating this vulnerability as it allows an authorized attacker to disclose information over a network.

Recommended defensive actions

  • Apply the patch provided by Microsoft
  • Review and update AD FS configurations to ensure secure settings
  • Monitor AD FS logs for suspicious activity
  • Implement compensating controls to limit the impact of a potential exploit
  • Review relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record was published on 2026-07-14T18:18:39.550Z and was last modified on 2026-07-16T13:45:02.420Z. The NVD entry is currently Analyzed. The vulnerability is an out-of-bounds read in Active Directory Federation Services (AD FS) that allows an authorized attacker to disclose information over a network. Evidence is limited to CVE and NVD details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-58529 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-58529

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-58529 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-58529

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.