EUVD-2026-44314
GHSA-6q58-22x4-6rcv
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Local-only UAF in a privileged service requires an authenticated low-priv account (PR:L) and a race win (AC:H); success yields full local C/I/A compromise.
Primary rating from Vendor (microsoft).
CVSS VectorNVD
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionNVD
Use after free in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.
AnalysisAI
Local privilege escalation in the Microsoft Windows Client-Side Caching (CSC) Service, driven by a use-after-free (CWE-416) memory-corruption flaw affecting Windows 10 (1607 through 22H2), Windows 11 (24H2/25H2/26H1), and Windows Server 2012 through 2025. An authorized attacker who already holds low-level privileges (PR:L) on the host can trigger the freed-object reuse to gain elevated, likely SYSTEM-level, privileges. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an already-authenticated local presence on the target: the CVSS vector is AV:L (no remote/network trigger) and PR:L (a valid low-privileged local account is needed), with UI:N (no victim interaction). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a moderate-severity, patch-now-on-normal-cadence issue rather than a fire-drill. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who has already gained a low-privileged foothold on a Windows host (for example, via phishing or a compromised standard user account) invokes the Client-Side Caching service and races its object lifecycle to trigger the use-after-free, reallocating the freed memory with attacker-controlled data. Because AC:H, the exploit likely needs multiple attempts to win the timing/heap-grooming race, but on success it elevates the attacker to the service's privileged (SYSTEM-level) context. … |
| Remediation | Apply the Microsoft security update for CVE-2026-58637 (Patch available per vendor advisory) for each affected SKU via Windows Update / WSUS / your patch-management tooling; the authoritative fix and per-SKU KB numbers are published at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-58637. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all Windows 10 (builds 1607-22H2), Windows 11 (24H2, 25H2, 26H1), and Windows Server (2012-2025) systems to identify exposure; coordinate with infrastructure teams and prioritize high-value targets (domain controllers, sensitive data repositories). …
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Same weakness CWE-416 – Use After Free
View allSame technique Use After Free
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External POC / Exploit Code
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