What is CVE-2026-26136?

CVE-2026-26136 is a medium-severity vulnerability in Microsoft Copilot, classified under Command Injection. CVSS score: 6.5/10. Published 2026-03-19.

How severe is CVE-2026-26136?

Medium severity. CVSS v3 base score is 6.5 out of 10.

RCE in Microsoft Copilot

CVE-2026-26136

Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to disclose information over a network.

Vulnerability class: Command Injection (OS Command Injection)

Published 2026-03-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.010 (60.8th percentile), scored 2026-10-19.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.010 · change: +0.003

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26136 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-26136?: CVE-2026-26136 is a medium-severity vulnerability in Microsoft Copilot, classified under Command Injection. CVSS score: 6.5/10. Published 2026-03-19.
How severe is CVE-2026-26136?: Medium severity. CVSS v3 base score is 6.5 out of 10.