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CVE-2026-45455

MEDIUMCVSS 4.3/10EPSS 0.63%

Last modified

CVE-2026-45455 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.. EPSS estimates a 0.63% chance of exploitation in the next 30 days.

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.

Metrics

CVSS 3.1
4.3/10

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

EPSS Probability
0.63%

45.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Microsoft365 AppsAll versions
MicrosoftExcel2016
MicrosoftMicrosoft 365All versions
MicrosoftOffice 2019All versions
MicrosoftOffice 2021All versions
MicrosoftOffice 2024All versions
MicrosoftOffice Online ServerAll versions

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-45455?
Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information over a network.
How severe is CVE-2026-45455?
CVE-2026-45455 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.63% probability of exploitation in the next 30 days.
How do I fix CVE-2026-45455?
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-2026-45455?

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

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Source: NVD / NIST