365 Apps CVE-2026-26144
HIGHCVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Lifecycle Timeline
2DescriptionNVD
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.
AnalysisAI
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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RemediationAI
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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