CVE-2025-55243Network attack vector

Unauthenticated network spoofing and information disclosure

Published Sep 9, 2025 · Updated Feb 20, 2026

Information exposure in Microsoft OfficePLUS before 3.10.0.26585 allows remote attackers to perform spoofing over a network. Microsoft has not disclosed the affected component, the operation that exposes information, the data revealed, or how that information enables spoofing. Network reachability is sufficient; no authentication or user interaction is required, and the documented consequence is limited to spoofing enabled by exposed sensitive information.

CVSS severity7.5
High
EPSS probability1.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information exposure in Microsoft OfficePLUS before 3.10.0.26585 allows remote attackers to perform spoofing over a network. Microsoft has not disclosed the affected component, the operation that exposes information, the data revealed, or how that information enables spoofing. Network reachability is sufficient; no authentication or user interaction is required, and the documented consequence is limited to spoofing enabled by exposed sensitive information.

The record

CVE
CVE-2025-55243
Published
Sep 9, 2025
Updated
Feb 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-200
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Feb 20, 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

7.5MicrosoftCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-200Exposure of Sensitive Information to an Unauthorized Actor

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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