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CVE-2026-26134

HIGHCVSS 7.8/10EPSS 0.35%

Last modified

CVE-2026-26134 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.. EPSS estimates a 0.35% chance of exploitation in the next 30 days.

Description

Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.35%

27.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Microsoft365 Copilot< 16.0.19822.20000

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-26134?
Integer overflow or wraparound in Microsoft Office allows an authorized attacker to elevate privileges locally.
How severe is CVE-2026-26134?
CVE-2026-26134 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.35% probability of exploitation in the next 30 days.
How do I fix CVE-2026-26134?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-26134?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST