Microsoft Office vulnerabilities: known CVEs & security history
Microsoft · Office / Productivity · 56 tracked CVEs · 4 actively exploited · updated September 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Microsoft Office release lines — 56 in total, with 4 actively exploited in the wild. A CVE here doesn't mean your version is affected — check Microsoft Office's current status and the safe version to run.
Known Microsoft Office CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-21509⚡ exploited | high | 7.8 | 72% | 2026 |
| CVE-2021-42292⚡ exploited | high | 7.8 | 32% | 2021 |
| CVE-2021-38646⚡ exploited | high | 7.8 | 4% | 2021 |
| CVE-2021-27059⚡ exploited | high | 7.6 | 3% | 2021 |
| CVE-2023-21716 | critical | 9.8 | 82% | 2023 |
| CVE-2020-0901 | critical | 9.8 | 12% | 2020 |
| CVE-2024-30103 | high | 8.8 | 3% | 2024 |
| CVE-2024-21378 | high | 8.8 | 11% | 2024 |
| CVE-2022-41106 | high | 8.8 | 2% | 2022 |
| CVE-2021-34469 | high | 8.2 | 3% | 2021 |
| CVE-2023-36897 | high | 8.1 | 2% | 2023 |
| CVE-2026-55130 | high | 7.8 | 0% | 2026 |
| CVE-2026-55120 | high | 7.8 | 0% | 2026 |
| CVE-2024-38016 | high | 7.8 | 1% | 2024 |
| CVE-2024-43465 | high | 7.8 | 1% | 2024 |
| CVE-2024-43463 | high | 7.8 | 1% | 2024 |
| CVE-2024-38250 | high | 7.8 | 1% | 2024 |
| CVE-2024-30104 | high | 7.8 | 2% | 2024 |
| CVE-2024-21379 | high | 7.8 | 2% | 2024 |
| CVE-2024-20673 | high | 7.8 | 1% | 2024 |
| CVE-2023-36896 | high | 7.8 | 1% | 2023 |
| CVE-2023-36895 | high | 7.8 | 1% | 2023 |
| CVE-2023-36866 | high | 7.8 | 1% | 2023 |
| CVE-2023-36865 | high | 7.8 | 1% | 2023 |
| CVE-2023-35372 | high | 7.8 | 1% | 2023 |
| CVE-2023-35371 | high | 7.8 | 1% | 2023 |
| CVE-2022-41107 | high | 7.8 | 1% | 2022 |
| CVE-2022-41063 | high | 7.8 | 1% | 2022 |
| CVE-2022-41061 | high | 7.8 | 1% | 2022 |
| CVE-2021-40442 | high | 7.8 | 2% | 2021 |
| CVE-2021-38658 | high | 7.8 | 5% | 2021 |
| CVE-2021-38655 | high | 7.8 | 5% | 2021 |
| CVE-2021-38654 | high | 7.8 | 5% | 2021 |
| CVE-2021-38653 | high | 7.8 | 5% | 2021 |
| CVE-2021-36941 | high | 7.8 | 2% | 2021 |
| CVE-2021-34478 | high | 7.8 | 54% | 2021 |
| CVE-2021-34452 | high | 7.8 | 2% | 2021 |
| CVE-2021-34501 | high | 7.8 | 53% | 2021 |
| CVE-2021-27057 | high | 7.8 | 3% | 2021 |
| CVE-2021-27056 | high | 7.8 | 3% | 2021 |
| CVE-2021-27054 | high | 7.8 | 3% | 2021 |
| CVE-2021-27053 | high | 7.8 | 4% | 2021 |
| CVE-2021-24108 | high | 7.8 | 2% | 2021 |
| CVE-2021-38650 | high | 7.6 | 1% | 2021 |
| CVE-2024-30101 | high | 7.5 | 2% | 2024 |
| CVE-2026-47293 | high | 7 | 0% | 2026 |
| CVE-2021-27055 | high | 7 | 2% | 2021 |
| CVE-2026-70105 | medium | 6.5 | 1% | 2026 |
| CVE-2026-55054 | medium | 6.5 | 1% | 2026 |
| CVE-2023-36893 | medium | 6.5 | 2% | 2023 |
| CVE-2021-41368 | medium | 6.1 | 4% | 2021 |
| CVE-2026-55121 | medium | 5.5 | 0% | 2026 |
| CVE-2022-41105 | medium | 5.5 | 1% | 2022 |
| CVE-2022-41104 | medium | 5.5 | 1% | 2022 |
| CVE-2022-41103 | medium | 5.5 | 1% | 2022 |
| CVE-2022-41060 | medium | 5.5 | 1% | 2022 |
Is my Microsoft Office version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Microsoft Office version → · Monitor Microsoft Office for new CVEs →
Microsoft Office vulnerabilities — frequently asked
How many known vulnerabilities does Microsoft Office have?
IsItPatched tracks 56 CVEs for Microsoft Office, 4 of which are actively exploited (CISA KEV). 2 are critical-severity and 45 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Microsoft Office have any actively-exploited vulnerabilities?
Yes — 4 Microsoft Office CVEs are in CISA's Known Exploited Vulnerabilities catalog, meaning they are confirmed exploited in the wild (1 linked to ransomware). Patch these as a priority.
What is the most severe Microsoft Office vulnerability?
Among tracked issues, CVE-2026-21509 (HIGH, CVSS 7.8), which is actively exploited, ranks highest — a CWE-807 weakness.
Is Microsoft Office safe to use?
It depends on the version. The latest supported Microsoft Office release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Microsoft Office security status · Microsoft Office end-of-life · actively-exploited CVEs. Always verify against Microsoft's advisories — see our disclaimer.