CVE-2025-26687
CVE-2025-26687 is a high-severity vulnerability in Microsoft 365 Copilot with a CVSS 3.x base score of 7.5. 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-416.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- EPSS exploit prediction: 1% (59th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-10194
- Weakness: CWE-416
- Affected product: Microsoft 365 Copilot
- Published:
- Last modified:
Description
Use after free in Windows Win32K - GRFX allows an unauthorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2025-26687?
- Use after free in Windows Win32K - GRFX allows an unauthorized attacker to elevate privileges over a network.
- How severe is CVE-2025-26687?
- CVE-2025-26687 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2025-26687 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (59th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-26687?
- CVE-2025-26687 primarily affects Microsoft 365 Copilot. In total, 23 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2025-26687?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-26687 have an EU (EUVD) identifier?
- Yes. CVE-2025-26687 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-10194.
- When was CVE-2025-26687 published?
- CVE-2025-26687 was published on 2025-04-08 and last updated on 2026-06-17.
References
Affected products (23)
- cpe:2.3:a:microsoft:365_copilot:*:*:*:*:*:android:*:*
- cpe:2.3:a:microsoft:office:*:*:*:*:*:universal:*:*
- cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x64:*
- cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:*
- cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x64:*
- cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:*
- cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
- cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:*
- cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_11_22h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x64:*
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:x86:*
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:*
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:*
- cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
More vulnerabilities in Microsoft 365 Copilot
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- 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-2021-43905 — Critical (CVSS 9.6): Microsoft Office app Remote Code Execution Vulnerability
- CVE-2026-41106 — Critical (CVSS 9.3): Url redirection to untrusted site ('open redirect') in M365 Copilot allows an unauthorized attacker to elevate…
- CVE-2026-41090 — Critical (CVSS 9.3): Improper neutralization of special elements used in a command ('command injection') in Microsoft Copilot allows an…
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