CVE-2026-70306Network attack vector

Spoofing via unneutralized web output

Published Aug 11, 2026 · Updated Aug 25, 2026

Cross-site scripting in Microsoft SharePoint Server allows remote attackers to spoof trusted content via crafted web requests. Microsoft has not published which page or parameter fails to neutralize attacker-controlled input before SharePoint renders it into a response. Exploitation is network-reachable and unauthenticated, but it requires a victim to load the malicious SharePoint content or follow a crafted link, with no published server-side code-execution impact.

CVSS severityUnavailable
Unscored
EPSS probability0.75%
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 trusted content via crafted web requests. Microsoft has not published which page or parameter fails to neutralize attacker-controlled input before SharePoint renders it into a response. Exploitation is network-reachable and unauthenticated, but it requires a victim to load the malicious SharePoint content or follow a crafted link, with no published server-side code-execution impact.

The record

CVE
CVE-2026-70306
Published
Aug 11, 2026
Updated
Aug 25, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.3Microsoft CNACVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
T1059.007JavaScript

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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