CVE-2026-88210

HIGH

Published Oct 13, 2026 Modified Oct 15, 2026 CWE-807

Description

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally.

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CVSS v3.1 Score

7.8

HIGH

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

EPSS — Exploit Prediction

0.0042

Probability of exploitation

0.35%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-807 CWE-807

Affected Products

Vendor	Product	Versions
microsoft	365_apps	All
microsoft	365_apps	All
microsoft	microsoft_365	All
microsoft	office_2021	All
microsoft	office_2024	All
microsoft	office_2024	All
microsoft	office_2024	All

References

Advisories & Patches

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-88210

Frequently Asked Questions

What is CVE-2026-88210? +

Reliance on untrusted inputs in a security decision in Microsoft Office Word allows an unauthorized attacker to bypass a security feature locally. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-88210? +

CVE-2026-88210 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0042, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-88210? +

CVE-2026-88210 affects products from microsoft, specifically: 365_apps, microsoft_365, office_2021, office_2024. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-88210? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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