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High 7.3Published Jul 14, 2026
CVE-2026-55021Microsoft SharePoint Server Spoofing Vulnerability
Updated under an hour ago ()
Does this affect you?
It affects Microsoft SharePoint Enterprise Server 2016 and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.3 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-79
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Microsoft Microsoft SharePoint Enterprise Server 2016 microsoft:sharepoint_enterprise_server_2016 (from the name) | from 16.0.0 before 16.0.5561.1001 | CNA record |
Microsoft Microsoft SharePoint Server 2019 microsoft:sharepoint_server_2019 (from the name) | from 16.0.0 before 16.0.10417.20175 | CNA record |
Microsoft Microsoft SharePoint Server Subscription Edition microsoft:sharepoint_server_subscription_edition (from the name) | from 16.0.0 before 16.0.19725.20434 | CNA record |
microsoft sharepoint_server microsoft:sharepoint_server | before 16.0.19725.20434; 2016; 2019 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55021vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.