CVE tracker / CVE-2026-55135

CVE-2026-55135

CVE-2026-55135 is the Microsoft SharePoint Server Spoofing Vulnerability. Microsoft rates it Important, CVSS 4.6. It is not in CISA's Known Exploited Vulnerabilities catalog. Published July 14, 2026.

Risk summary

MediumSpoofing
4.6
CVSS v3 base
0.6%
EPSS: chance of exploitation in 30 days
Medium
Severity
Important
Microsoft's rating
Less Likely
Microsoft: exploitation
No
In CISA KEV

Microsoft describes it: “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.”

How to fix it

Microsoft lists 3 affected products and the update that fixes each:

What Microsoft changed

Details

Weakness
CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Publicly disclosed (Microsoft)
No
Exploited (Microsoft)
No
Known exploited (CISA KEV)
Not listed
Published
July 14, 2026
Last revised
July 14, 2026

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References

Microsoft Security Update Guide NVD CVE record CWE

From Microsoft, CISA, NVD and FIRST data; the Microsoft details were read when this page was opened. Check the references above before you act.