CVE-2026-26144Network attack vector

Information disclosure via undisclosed cross-site scripting

Published Mar 10, 2026 · Updated Mar 10, 2026

Cross-site scripting in Microsoft Office Excel in Microsoft 365 Apps for enterprise allows remote attackers to disclose information over a network. Microsoft has not published the affected Excel rendering locus, the untrusted input field, or the operation that fails to neutralize it. No authentication or user interaction is required; the published impact is limited to information disclosure, with the exposed data undisclosed.

CVSS severity7.5
High
EPSS probability1.21%
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 Office Excel in Microsoft 365 Apps for enterprise allows remote attackers to disclose information over a network. Microsoft has not published the affected Excel rendering locus, the untrusted input field, or the operation that fails to neutralize it. No authentication or user interaction is required; the published impact is limited to information disclosure, with the exposed data undisclosed.

The record

CVE
CVE-2026-26144
Published
Mar 10, 2026
Updated
Mar 10, 2026
Vendor
Microsoft
Product
Microsoft 365 Apps for enterprise
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=16.0.1 <https://aka.ms/OfficeSecurityReleases

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Microsoft · Microsoft 365 Apps for enterpriseversion=16.0.1 <https://aka.ms/OfficeSecurityReleases

Published CVSS scores

7.5Microsoft CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
4.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/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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