CVE-2026-26144

HIGH
2026-03-10 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 21:55 vuln.today
CVE Published
Mar 10, 2026 - 18:18 nvd
HIGH 7.5

Tags

Microsoft XSS 365 Apps

Description

Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Analysis

Information disclosure in Microsoft 365 Apps Excel allows unauthenticated remote attackers to extract sensitive data through stored cross-site scripting attacks in generated web content. The vulnerability requires no user interaction and affects all Excel users who process untrusted documents. …

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Remediation

Within 24 hours: Inventory all Excel files containing sensitive data and restrict sharing to trusted internal recipients only; notify users to avoid opening Excel files from untrusted external sources. Within 7 days: Implement network segmentation to isolate Excel processing from sensitive systems; deploy email gateway controls to block or quarantine suspicious Excel attachments. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-26144 vulnerability details – vuln.today
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