Vulnerability · Published May 22, 2026 · Assigned by microsoft
CVE-2026-41090Microsoft Copilot Tampering Vulnerability
Critical 9.3
In plain English
A critical-severity command injection in Microsoft 365 Copilot for iOS from Microsoft. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Severity (CVSS 3.1)9.3Critical
Exploit odds (30 days)0.4%top 63.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft 365 Copilot for iOS | - |
Weakness: CWE-77 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
References
- Microsoft Copilot Tampering Vulnerability vendor-advisory, patch