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CVE-2026-55034: Microsoft SharePoint Server Spoofing Vulnerability

highCVSS 7.3CVE-2026-55034
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.

CSIRTS triage

vendor: Microsoftproduct: Microsoft SharePoint ServerCross-site scripting
What
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.
Who is affected
Authorized users of Microsoft SharePoint Server are affected.
Urgency
Remediation is urgent due to the high severity and potential for spoofing attacks.
Action
Apply the latest security patch to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.3
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-55034coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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