How severe is CVE-2026-41090?

CVE-2026-41090 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 user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-41090 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41090?

CVE-2026-41090 affects Microsoft 365 Copilot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41090?

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-2026-41090 have an EU (EUVD) identifier?

Yes. CVE-2026-41090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31512.

When was CVE-2026-41090 published?

CVE-2026-41090 was published on 2026-05-22 and last updated on 2026-06-17.

CVE-2026-41090

CVE-2026-41090 is a critical-severity vulnerability in Microsoft 365 Copilot 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: 0% (34th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31512
Weakness: CWE-77
Affected product: Microsoft 365 Copilot
Published: 2026-05-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-41090?: Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an unauthorized attacker to perform tampering over a network.
How severe is CVE-2026-41090?: CVE-2026-41090 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 user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-41090 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41090?: CVE-2026-41090 affects Microsoft 365 Copilot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41090?: 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-2026-41090 have an EU (EUVD) identifier?: Yes. CVE-2026-41090 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31512.
When was CVE-2026-41090 published?: CVE-2026-41090 was published on 2026-05-22 and last updated on 2026-06-17.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-41090

Affected products (1)

cpe:2.3:a:microsoft:365_copilot:-:*:*:*:*:iphone_os:*:*

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