How severe is CVE-2026-97008?

CVE-2026-97008 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-2026-97008 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-97008?

CVE-2026-97008 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-2026-97008?

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-2026-97008 published?

CVE-2026-97008 was published on 2026-10-13 and last updated on 2026-10-15.

CVE-2026-97008

CVE-2026-97008 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-124.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-124
Affected product: Microsoft 365 Apps
Published: 2026-10-13
Last modified: 2026-10-15

Description

Buffer underwrite ('buffer underflow') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

Frequently asked questions

What is CVE-2026-97008?: Buffer underwrite ('buffer underflow') in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.
How severe is CVE-2026-97008?: CVE-2026-97008 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-2026-97008 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-97008?: CVE-2026-97008 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-2026-97008?: 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-2026-97008 published?: CVE-2026-97008 was published on 2026-10-13 and last updated on 2026-10-15.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-97008

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 →

Other CWE-124 vulnerabilities

CVE-2026-44631 — Critical (CVSS 9.8): Buffer Underwrite vulnerability in Apache HTTP Server on crafted regular expressions in the configuration. This issue…
CVE-2023-25610 — Critical (CVSS 9.8): A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of Fortinet FortiOS version…
CVE-2026-16439 — Critical (CVSS 9.1): In Eclipse OpenJ9 versions up to 0.60, using -Xtrace to trace method arguments can lead to buffer underflow.
CVE-2025-27440 — High (CVSS 8.5): Heap overflow in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via…
CVE-2025-27439 — High (CVSS 8.5): Buffer underflow in some Zoom Workplace Apps may allow an authenticated user to conduct an escalation of privilege via…
CVE-2026-34253 — High (CVSS 8.2): A buffer underflow vulnerability has been identified in the ogg123 utility from the vorbis-tools 1.4.3 package in…

Browse all CWE-124 vulnerabilities →