PatchTheCVECVE-2026-42893: Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an
CVE-2026-42893 is a high-severity flaw (CVSS 7.4) affecting outlook. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.
Why this priority
- High severity
- On your watchlist
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.4 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.4% (top 66%) |
| CISA exploited list | No |
| Weakness | CWE-77 |
| Published | 2026-05-12 |
| Last modified | 2026-10-26 |
Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-42893?
outlook: upgrade to 5.2617.1. Exact commands for each OS are on this page.
Is CVE-2026-42893 being exploited?
CVE-2026-42893 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-42893 affect?
CVE-2026-42893 affects outlook. Severity is high (CVSS 7.4). Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to perform tampering over a network.
How urgent is CVE-2026-42893?
Priority 39/100. High severity; On your watchlist
Software pages
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