CVE-2026-85885
CVE-2026-85885 is a critical-severity vulnerability in Microsoft 365 Copilot with a CVSS 3.x base score of 9.9. 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 9.9)
- EPSS exploit prediction: 1% (52nd percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-77
- Affected product: Microsoft 365 Copilot
- Published:
- Last modified:
Description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2026-85885?
- Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an authorized attacker to elevate privileges over a network.
- How severe is CVE-2026-85885?
- CVE-2026-85885 has a CVSS 3.x base score of 9.9, rated critical severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-85885 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (52nd percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-85885?
- CVE-2026-85885 affects Microsoft 365 Copilot. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-85885?
- 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.
- When was CVE-2026-85885 published?
- CVE-2026-85885 was published on 2026-09-17 and last updated on 2026-09-25.
References
Affected products (1)
- cpe:2.3:a:microsoft:365_copilot:-:*:*:*:*:*:*:*
More vulnerabilities in Microsoft 365 Copilot
- CVE-2026-50517 — Critical (CVSS 9.9): Deserialization of untrusted data in M365 Copilot allows an authorized attacker to execute code over a network.
- CVE-2026-54130 — Critical (CVSS 9.8): Missing authentication for critical function in M365 Copilot allows an unauthorized attacker to disclose information…
- CVE-2025-60724 — Critical (CVSS 9.8): Heap-based buffer overflow in Microsoft Graphics Component allows an unauthorized attacker to execute code over a…
- CVE-2025-53766 — Critical (CVSS 9.8): Heap-based buffer overflow in Windows GDI+ allows an unauthorized attacker to execute code over a network.
- CVE-2026-48561 — Critical (CVSS 9.6): Improper neutralization of special elements used in a command ('command injection') in Copilot Chat (Microsoft Edge)…
- CVE-2021-43905 — Critical (CVSS 9.6): Microsoft Office app Remote Code Execution Vulnerability
All CVEs affecting Microsoft 365 Copilot →
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