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High 8.8Published Oct 13, 2026
CVE-2026-97780Microsoft Office Excel Remote Code Execution Vulnerability
Updated under an hour ago ()
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It affects Microsoft 365 Apps for Enterprise and 10 other products. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.78%, higher than 55% of scored CVEs.
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Heap-based buffer overflow in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
- CVSS
- 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Weakness (CWE)
- CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.78% (percentile 55)
- Assigned by
- microsoft
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 13, 2026
Affected products
Microsoft Microsoft 365 Apps for Enterprise microsoft:365_apps_for_enterprise (from the name) | from 16.0.1 before https://aka.ms/OfficeSecurityReleases | CNA record |
Microsoft Microsoft Office 365 for Mac microsoft:office_365_for_mac (from the name) | from 1.0.0 before 16.114.26101123 | CNA record |
Microsoft Microsoft Office LTSC 2021 microsoft:office_ltsc_2021 (from the name) | from 16.0.1 before 16.0.14334.20974 | CNA record |
Microsoft Microsoft Office LTSC 2024 microsoft:office_ltsc_2024 (from the name) | from 16.0.0 before 16.0.17932.21056 | CNA record |
Microsoft Microsoft Office LTSC for Mac 2021 microsoft:office_ltsc_for_mac_2021 (from the name) | from 16.0.1 before 16.114.26101123 | CNA record |
Microsoft Microsoft Office LTSC for Mac 2024 microsoft:office_ltsc_for_mac_2024 (from the name) | from 16.0.0 before 16.114.26101123 | CNA record |
Microsoft Office Online Server microsoft:office_online_server (from the name) | from 16.0.0.0 before 16.0.10417.20228 | CNA record |
microsoft 365_apps microsoft:365_apps | all versions; all versions | NVD |
microsoft microsoft_365 microsoft:microsoft_365 | all versions | NVD |
microsoft office_2021 microsoft:office_2021 | all versions; all versions; all versions | NVD |
microsoft office_2024 microsoft:office_2024 | all versions; all versions; all versions | NVD |
microsoft office_online_server microsoft:office_online_server | before 16.0.10417.20228 | NVD |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97780vendor-advisory, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.