CVE-2026-26105Network attack vector

Unauthenticated spoofing via cross-site scripting

Published Mar 10, 2026 · Updated Mar 10, 2026

Cross-site scripting in Microsoft SharePoint Server allows remote attackers to spoof content over a network after user interaction. Microsoft identifies improper neutralization during web-page generation but has not published the affected endpoint, input field, or missing encoding operation. The attack requires no SharePoint privileges but requires a victim to interact with attacker-controlled content; reported impact is limited to confidentiality and integrity, with no service interruption.

CVSS severity8.1
High
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Microsoft SharePoint Server allows remote attackers to spoof content over a network after user interaction. Microsoft identifies improper neutralization during web-page generation but has not published the affected endpoint, input field, or missing encoding operation. The attack requires no SharePoint privileges but requires a victim to interact with attacker-controlled content; reported impact is limited to confidentiality and integrity, with no service interruption.

The record

CVE
CVE-2026-26105
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Microsoft
Product
Microsoft SharePoint Enterprise Server 2016
Classifications
CWE-79
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=16.0.0 <16.0.5543.1000

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft SharePoint Enterprise Server 2016version=16.0.0 <16.0.5543.1000
Microsoft · Microsoft SharePoint Server 2019version=16.0.0 <16.0.10417.20102
Microsoft · Microsoft SharePoint Server Subscription Editionversion=16.0.0 <16.0.19725.20076

Published CVSS scores

9.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
8.1Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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