Microsoft Office vulnerabilities: known CVEs & security history
Microsoft · Office / Productivity · 9 tracked CVEs · 1 actively exploited · updated August 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Microsoft Office release lines — 9 in total, with 1 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-2024-30103 | high | 8.8 | 3% | 2024 |
| CVE-2026-55130 | high | 7.8 | 0% | 2026 |
| CVE-2026-55120 | high | 7.8 | 0% | 2026 |
| CVE-2024-30104 | high | 7.8 | 2% | 2024 |
| CVE-2024-30101 | high | 7.5 | 2% | 2024 |
| CVE-2026-47293 | high | 7 | 0% | 2026 |
| CVE-2026-55054 | medium | 6.5 | 1% | 2026 |
| CVE-2026-55121 | medium | 5.5 | 0% | 2026 |
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 9 CVEs for Microsoft Office, 1 of which is actively exploited (CISA KEV). 0 are critical-severity and 7 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 — 1 Microsoft Office CVE is in CISA's Known Exploited Vulnerabilities catalog, meaning it is confirmed exploited in the wild. Patch it 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.