CVE-2026-26129
HIGHCVSS 7.5/10EPSS 1.14%
Last modified
CVE-2026-26129 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.
Description
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | 365 Copilot Chat | All versions |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-26129?
Improper neutralization of special elements used in a command ('command injection') in M365 Copilot allows an unauthorized attacker to disclose information over a network.
How severe is CVE-2026-26129?
CVE-2026-26129 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.
How do I fix CVE-2026-26129?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-26122Initialization of a resource with an insecure default in Azu…6.5
- CVE-2026-26123Cwe is not in rca categories in Microsoft Authenticator allo…5.5
- CVE-2026-26124'.../...//' in Azure Compute Gallery allows an authorized at…6.7
- CVE-2026-26125Payment Orchestrator Service Elevation of Privilege Vulnerab…9.8
- CVE-2026-26127Out-of-bounds read in .NET allows an unauthorized attacker t…7.5
- CVE-2026-26128Improper authentication in Windows SMB Server allows an auth…7.8
- CVE-2026-26130Allocation of resources without limits or throttling in ASP.…7.5
- CVE-2026-26131Incorrect default permissions in .NET allows an authorized a…7.8
- CVE-2026-26132Use after free in Windows Kernel allows an authorized attack…7.8
- CVE-2026-26133AI command injection in M365 Copilot allows an unauthorized …7.1
- CVE-2026-26134Integer overflow or wraparound in Microsoft Office allows an…7.8
- CVE-2026-26135Server-side request forgery (ssrf) in Azure Custom Locations…8.8
Are you affected by CVE-2026-26129?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST