What is CVE-2025-59252?

CVE-2025-59252 is a critical-severity vulnerability in Microsoft 365 Word Copilot, classified under Command Injection. CVSS score: 9.3/10. Published 2025-10-09.

How severe is CVE-2025-59252?

Critical severity. CVSS v3 base score is 9.3 out of 10.

Is CVE-2025-59252 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

RCE in Microsoft 365 Word Copilot

CVE-2025-59252

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

Vulnerability class: Command Injection (OS Command Injection)

Published 2025-10-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.3 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.2th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-77 — Command Injection

Public proof-of-concept exploits

fkie-cad/nvd-json-data-feeds

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59252 (vendor-advisory, patch, Vendor Advisory)

Frequently asked questions

What is CVE-2025-59252?: CVE-2025-59252 is a critical-severity vulnerability in Microsoft 365 Word Copilot, classified under Command Injection. CVSS score: 9.3/10. Published 2025-10-09.
How severe is CVE-2025-59252?: Critical severity. CVSS v3 base score is 9.3 out of 10.
Is CVE-2025-59252 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.