EUVD-2026-73936
GHSA-cgvg-jx73-642p
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Network-accessible XSS with no auth required (PR:N) but user interaction needed (UI:R); impact is confidentiality-only via session theft with no integrity or availability consequence.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
3DescriptionCVE.org
Improper neutralization of input during web page generation ('cross-site scripting') in Skype for Business allows an unauthorized attacker to perform spoofing over a network.
AnalysisAI
Cross-site scripting in Microsoft Skype for Business Server enables network-based spoofing against authenticated users across three distinct server product lines. An unauthenticated remote attacker can inject malicious script into a vulnerable web component that executes in a victim's browser upon user interaction, resulting in high-confidentiality-impact session token theft or UI-level spoofing consistent with the CVSS C:H/I:N pairing. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that a victim user click or visit a crafted URL pointing to the vulnerable Skype for Business Server web component, as confirmed by the UI:R metric in the CVSS vector. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 6.5 (Medium) vector AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N is internally consistent: exploitation is network-accessible with low complexity and requires no privileges (PR:N), but a victim must interact with attacker-controlled content (UI:R), meaningfully reducing practical exploitability relative to fully autonomous attacks. … 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 Microsoft's cumulative updates to reach the fixed builds: upgrade Skype for Business Server Subscription Edition CU1 to build 7.0.2046.879 or later, Server 2019 CU8 to 7.0.2046.569 or later, and Server 2015 CU13 to 6.0.9319.885 or later. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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