Microsoft 365 Copilot vulnerabilities: known CVEs & security history
Microsoft · AI / LLM Gateway · 5 tracked CVEs · 0 actively exploited · updated September 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Microsoft 365 Copilot release lines — 5 in total. A CVE here doesn't mean your version is affected — check Microsoft 365 Copilot's current status and the safe version to run.
Known Microsoft 365 Copilot CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-24301 | high | 8.8 | 2% | 2026 |
| CVE-2026-45497 | high | 7.7 | 0% | 2026 |
| CVE-2026-42824 | medium | 6.5 | 8% | 2026 |
| CVE-2026-55145 | medium | 6.3 | 0% | 2026 |
| CVE-2026-55946 | medium | 6.1 | 1% | 2026 |
Is my Microsoft 365 Copilot 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 365 Copilot version → · Monitor Microsoft 365 Copilot for new CVEs →
Microsoft 365 Copilot vulnerabilities — frequently asked
How many known vulnerabilities does Microsoft 365 Copilot have?
IsItPatched tracks 5 CVEs for Microsoft 365 Copilot. 0 are critical-severity and 2 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Microsoft 365 Copilot have any actively-exploited vulnerabilities?
None of Microsoft 365 Copilot's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Microsoft 365 Copilot vulnerability?
Among tracked issues, CVE-2026-24301 (HIGH, CVSS 8.8) ranks highest — a Command injection weakness.
Is Microsoft 365 Copilot safe to use?
It depends on the version. The latest supported Microsoft 365 Copilot 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 365 Copilot security status · Microsoft 365 Copilot end-of-life · actively-exploited CVEs. Always verify against Microsoft's advisories — see our disclaimer.