How severe is CVE-2025-59286?

CVE-2025-59286 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2025-59286 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-59286?

CVE-2025-59286 affects Microsoft 365 Copilot Chat. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-59286?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-59286 have an EU (EUVD) identifier?

Yes. CVE-2025-59286 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33546.

When was CVE-2025-59286 published?

CVE-2025-59286 was published on 2025-10-09 and last updated on 2026-06-17.

CVE-2025-59286

CVE-2025-59286 is a critical-severity vulnerability in Microsoft 365 Copilot Chat with a CVSS 3.x base score of 9.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.3)
EPSS exploit prediction: 1% (45th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-33546
Weakness: CWE-77
Affected product: Microsoft 365 Copilot Chat
Published: 2025-10-09
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2025-59286?: Improper neutralization of special elements used in a command ('command injection') in Copilot allows an unauthorized attacker to disclose information over a network.
How severe is CVE-2025-59286?: CVE-2025-59286 has a CVSS 3.x base score of 9.3, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2025-59286 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-59286?: CVE-2025-59286 affects Microsoft 365 Copilot Chat. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-59286?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-59286 have an EU (EUVD) identifier?: Yes. CVE-2025-59286 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-33546.
When was CVE-2025-59286 published?: CVE-2025-59286 was published on 2025-10-09 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-59286

Affected products (1)

cpe:2.3:a:microsoft:365_copilot_chat:-:*:*:*:*:*:*:*

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