Threat Intelligence / CVE / CVE-2026-26144

CVE-2026-26144 — Microsoft 365 Apps

CVSS v3.1 7.5 (HIGH) · EPSS 0.1% (higher than 28.3% of all scored CVEs) · Priority 4.9/10 · Published 2026-03-10

As of 2026-03-13, CVE-2026-26144 is a HIGH-severity vulnerability in Microsoft 365 Apps, CVSS v3.1 7.5, EPSS 0.1% (28.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-26144, most recently “Microsoft Office RCE via Preview Pane (CVE-2026-26110, CVE-2026-26113) — March 2026 Patch Tuesday”.

Last updated: 2026-03-13

What is 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.

The record classifies CVE-2026-26144 under weakness class CWE-79. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality. 2 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 187 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.5 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 28.3% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-03-10, last modified 2026-03-13

Is CVE-2026-26144 being exploited?

It currently carries a trending score of 12 in the Threadlinqs vulnerability feed.

Affected products and versions

Showing 1 of 2 recorded product entries.

How to fix CVE-2026-26144

The record marks a vendor fix as available for CVE-2026-26144. Patch reference: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26144. Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26144. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-26144

1 tracked threat in the Threadlinqs corpus references CVE-2026-26144, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from research and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-26144 are available via the Threadlinqs MCP server (Purple tier). View plans →

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