Exploited Vulnerabilities DailyCVE-2026-21509: Microsoft Office
EPSS70.7%No. 718 of 1739 in KEV
CVE year2026listed the same year
Same vendor in KEV389
Same product29
| Field | Value |
|---|---|
| Vendor | Microsoft |
| Product | Office |
| Name | Microsoft Office Security Feature Bypass Vulnerability |
| Added to KEV | 2026-01-26 |
| US federal due date | 2026-02-16 |
| Ransomware use | Unknown |
| CWE | CWE-807 |
CISA description
Microsoft Office contains a security feature bypass vulnerability in which reliance on untrusted inputs in a security decision in Microsoft Office could allow an unauthorized attacker to bypass a security feature locally. Some of the impacted product(s) could be end-of-life (EoL) and/or end-of-service (EoS). Users are advised to discontinue use and/or transition to a supported version.
Other entries for this product
| CVE | Vendor / product | Added | EPSS | Ransomware |
|---|---|---|---|---|
| CVE-2009-0238 | Microsoft Office | 2026-04-14 | 43.2% | Unknown |
| CVE-2026-21514 | Microsoft Office | 2026-02-10 | 1.6% | Unknown |
| CVE-2009-0556 | Microsoft Office | 2026-01-07 | 67.3% | Unknown |
| CVE-2007-0671 | Microsoft Office | 2025-08-12 | 43.2% | Unknown |
| CVE-2023-23397 | Microsoft Office | 2023-03-14 | 97.1% | Unknown |
| CVE-2023-21715 | Microsoft Office | 2023-02-14 | 12.0% | Unknown |
| CVE-2013-1331 | Microsoft Office | 2022-06-08 | 79.8% | Unknown |
| CVE-2009-0563 | Microsoft Office | 2022-06-08 | 62.8% | Unknown |
| CVE-2009-0557 | Microsoft Office | 2022-06-08 | 53.0% | Unknown |
| CVE-2021-38646 | Microsoft Office | 2022-03-28 | 7.9% | Known |
| CVE-2015-1770 | Microsoft Office | 2022-03-28 | 34.9% | Unknown |
| CVE-2017-11826 | Microsoft Office | 2022-03-03 | 81.1% | Unknown |
| CVE-2017-0261 | Microsoft Office | 2022-03-03 | 78.1% | Unknown |
| CVE-2016-7193 | Microsoft Office | 2022-03-03 | 57.5% | Unknown |
| CVE-2015-2545 | Microsoft Office | 2022-03-03 | 85.9% | Unknown |
Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page
A Microsoft Office vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2026-01-26.