Security readout for executives and security teams
Plain-English summary
A logged-in attacker could remotely trigger an AD FS memory-reading flaw and expose sensitive information. The supplied assessment rates it high severity because confidentiality impact may be substantial, although the evidence does not identify what data could be exposed.
Executive priority
Treat as a high-priority patching and exposure-validation item, especially for identity infrastructure handling sensitive authentication data. It is not supported as an emergency active-exploitation event, but the potential confidentiality impact justifies prompt action.
Technical view
CVE-2026-58529 is a CWE-125 out-of-bounds read in Active Directory Federation Services. It is network-accessible, low complexity, requires low privileges, and needs no user interaction. The supplied CVSS 3.1 score is 7.1, with high confidentiality impact, no integrity impact, and low availability impact.
Likely exposure
The bundle specifically lists Microsoft Windows 11 version 26H1, build 10.0.28000.0. Prioritize systems matching that version where AD FS functionality is present or relevant. The supplied evidence does not establish exposure for other Windows versions, builds, or products.
Exploitation context
The supplied data does not mark this CVE as included in KEV, and its CVSS exploit-maturity value is unproven. No cited evidence confirms active exploitation or public exploit availability. Successful abuse nevertheless requires an authorized attacker with low privileges and network access.
Researcher notes
The record identifies an out-of-bounds read but provides no vulnerable component path, disclosed data type, attack boundary details, or public proof of concept. Researchers should avoid extrapolating affected platforms beyond the listed Windows 11 build and should consult Microsoft’s advisory for authoritative revisions.
Mitigation direction
- Review Microsoft’s CVE advisory for the applicable security update and deployment instructions.
- Apply the Microsoft update to confirmed affected systems using normal change controls.
- Restrict unnecessary network access to AD FS services while remediation is pending.
- Monitor Microsoft guidance for revised affected-version or mitigation information.
Validation and detection
- Inventory Windows 11 26H1 systems and identify build 10.0.28000.0.
- Determine whether AD FS functionality is installed, enabled, or reachable on matching systems.
- Verify the Microsoft-listed security update is installed successfully on affected assets.
- Review authentication and service telemetry for unusual authorized access or disclosure-related anomalies.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-58529 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L/E:U/RL:O/RC:C
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L/E:U/RL:O/RC:C2.84.2microsoftVulnerability scoring details
Base CVSS 3.1 score
7.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L/E:U/RL:O/RC:C
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- Windows Active Directory Federation Services (ADFS) Information Disclosure VulnerabilityCVE reference, microsoft · vendor-advisory, patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.