How severe is CVE-2026-97775?

CVE-2026-97775 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-97775 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-97775?

CVE-2026-97775 primarily affects Microsoft 365 Apps. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-97775?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2026-97775 published?

CVE-2026-97775 was published on 2026-10-13 and last updated on 2026-10-15.

CVE-2026-97775

CVE-2026-97775 is a high-severity vulnerability in Microsoft 365 Apps with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Microsoft 365 Apps
Published: 2026-10-13
Last modified: 2026-10-15

Description

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-97775?: Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-97775?: CVE-2026-97775 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-97775 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-97775?: CVE-2026-97775 primarily affects Microsoft 365 Apps. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-97775?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2026-97775 published?: CVE-2026-97775 was published on 2026-10-13 and last updated on 2026-10-15.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97775

Affected products (10)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*
cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*
cpe:2.3:a:microsoft:microsoft_365:-:*:*:*:*:macos:*:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2021:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x64:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:-:x86:*
cpe:2.3:a:microsoft:office_2024:-:*:*:*:ltsc:macos:-:*
cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*

More vulnerabilities in Microsoft 365 Apps

CVE-2026-97749 — Critical (CVSS 9.8): Double free in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-97016 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-88178 — Critical (CVSS 9.8): Use after free in Microsoft Office PowerPoint allows an unauthorized attacker to execute code over a network.
CVE-2026-88156 — Critical (CVSS 9.8): Stack-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
CVE-2026-70300 — Critical (CVSS 9.8): Untrusted pointer dereference in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
CVE-2026-70291 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

All CVEs affecting Microsoft 365 Apps →

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