EUVD-2026-73157
GHSA-jq78-6f86-rfhh
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Network-exploitable XSS requiring a low-privilege authenticated account and victim interaction; limited confidentiality and integrity impact, no availability consequence, unchanged scope.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4DescriptionNVD
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
AnalysisAI
Cross-site scripting in Microsoft SharePoint Server Subscription Edition allows an authenticated network attacker with low-level privileges to inject malicious scripts into pages rendered by SharePoint, enabling spoofing attacks against other authenticated users. The flaw is classified CWE-79 and confirmed by Microsoft (secure@microsoft.com) with a vendor patch available targeting builds below 16.0.20326.20090. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The attacker must possess an authenticated account on the target SharePoint Server Subscription Edition instance with at least content-contribution privileges (CVSS PR:L). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.6 Medium rating accurately reflects a genuine but bounded risk: the attack is network-exploitable with low complexity, but two friction points - requiring an authenticated (PR:L) attacker account and mandatory victim interaction (UI:R) - meaningfully reduce the attack surface compared to unauthenticated or no-click XSS. … 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 vendor-released patch by upgrading Microsoft SharePoint Server Subscription Edition to build 16.0.20326.20090 or later via Microsoft's standard update mechanism; full details are available in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69690. … 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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