EUVD-2026-73504
GHSA-phm8-g358-pr28
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Network delivery with no auth required; user must open malicious content (UI:R); full process compromise yields C:H/I:H/A:H with no scope change.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Heap-based buffer overflow in Windows URL Moniker allows an unauthorized attacker to execute code over a network.
AnalysisAI
Heap-based buffer overflow in Windows URL Moniker (urlmon.dll) enables remote code execution across nearly every supported Windows release when a user interacts with attacker-controlled content. The vulnerability spans Windows Server 2012 through Server 2025 and Windows 10/11 across all major feature updates, making the attack surface exceptionally broad. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | User interaction is required: the victim must open, preview, or navigate to attacker-controlled content (a malicious Office document, a crafted web page, or any application that triggers URL Moniker binding). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) accurately captures the attack profile: network-reachable, low complexity, no authentication required, but user interaction is the sole gating control. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Apply the Microsoft-released patch immediately via Windows Update or WSUS, targeting the specific build thresholds listed per OS version (e.g., Windows 11 24H2 to 10.0.26100.9445 or later, Windows Server 2025 to 10.0.26100.33438 or later). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, notify all stakeholders of the vulnerability, confirm patch availability through Windows Update, and prioritize systems in customer-facing or externally-connected roles. …
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Same weakness CWE-122 – Heap-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
Leaving vuln.today