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ZDI-26-418: Microsoft SharePoint SPFieldMultiLineText Cross-Site Scripting Vulnerability

lowzdi_publishedPublished 2026-07-15

This vulnerability allows remote attackers to execute web requests with a target user's privileges on affected installations of Microsoft SharePoint. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.3. The following CVEs are assigned: CVE-2026-55126.

MITRE ATT&CK techniques

SharepointT1213.002
Malicious FileT1204.002

Indicators of compromise

CVE-2026-55126cve

Original source: http://www.zerodayinitiative.com/advisories/ZDI-26-418/