EUVD-2026-44318
GHSA-rwpj-48r2-w395
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Network-reachable AD FS endpoint (AV:N) exploitable with an authenticated low-privilege session (PR:L) and no user interaction; out-of-bounds read discloses sensitive memory (C:H) with possible service instability (A:L), no integrity impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
Lifecycle Timeline
2DescriptionCVE.org
Out-of-bounds read in Active Directory Federation Services (AD FS) allows an authorized attacker to disclose information over a network.
AnalysisAI
Information disclosure in Microsoft Active Directory Federation Services (AD FS) lets an authenticated, network-based attacker read memory outside intended bounds and leak sensitive data, per Microsoft's own report of the flaw (tracked in MSRC as CVE-2026-58529). The CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N, C:H) indicates low-privilege remote exploitation with high confidentiality impact; there is no public exploit identified at time of analysis and it is not on CISA KEV. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to reach a Microsoft AD FS network endpoint and to hold at least low-level authentication to that service (CVSS PR:L), so this is not an unauthenticated internet-wide risk; a valid AD FS credential or authenticated session is the concrete prerequisite. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are moderate and somewhat mixed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who holds a low-privilege authenticated foothold against the AD FS service sends specially crafted requests to a vulnerable endpoint, triggering the out-of-bounds read so the service returns adjacent process memory in its response. Over repeated requests the attacker harvests leaked fragments that may contain sensitive authentication material or configuration data. … |
| Remediation | Patch available per vendor advisory - apply the Microsoft security update for CVE-2026-58529 as listed in the MSRC update guide (https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58529); the input confirms a fix is available but does not enumerate an exact patched build number, so pull the specific KB/version from that advisory for your platform. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Microsoft Active Directory Federation Services deployments and consult the Microsoft Security Response Center (MSRC) advisory for CVE-2026-58529 to identify the applicable patch version for your environment; note platform discrepancies in affected CPE and verify with Microsoft whether your deployment is impacted. …
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External POC / Exploit Code
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