# CVE-2026-26129

## Summary

- **CVE ID:** CVE-2026-26129
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C)
- **CWE:** CWE-138
- **Published:** May 7, 2026
- **Last Modified:** Aug 10, 2026

## Description

Improper neutralization of special elements in M365 Copilot allows an unauthorized attacker to disclose information over a network.

## Affected Products

- Microsoft — Microsoft 365 Copilot's Business Chat (-)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-26129)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.14%
- **EPSS Percentile:** 64.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._