High severity7.5NVD Advisory· Published May 7, 2026· Updated Jun 1, 2026
CVE-2026-26164
CVE-2026-26164
Description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Affected products
2- cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26164nvdVendor Advisory
News mentions
4- Patch Tuesday - May 2026Rapid7 Blog · May 13, 2026
- Microsoft May 2026 Patch Tuesday fixes 120 flaws, no zero-daysBleepingComputer · May 12, 2026
- ⚡ Weekly Recap: Linux Rootkit, macOS Crypto Stealer, WebSocket Skimmers and MoreThe Hacker News · May 11, 2026
- May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEsCrowdStrike Blog