What is CVE-2026-26144?

CVE-2026-26144 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-03-10.

How severe is CVE-2026-26144?

High severity. CVSS v3 base score is 7.5 out of 10.

XSS in Microsoft 365 Apps For Enterprise

CVE-2026-26144

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.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.001 (30.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C.

Affected products

Microsoft 365 Apps For Enterprise — versions 16.0.1

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Microsoft Excel Information Disclosure Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-26144?: CVE-2026-26144 is a high-severity vulnerability in Microsoft 365 Apps For Enterprise, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-03-10.
How severe is CVE-2026-26144?: High severity. CVSS v3 base score is 7.5 out of 10.