# CVE-2026-69378

## Summary

- **CVE ID:** CVE-2026-69378
- **Severity:** HIGH
- **CVSS Score:** 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
- **CWE:** CWE-674
- **Published:** Sep 8, 2026
- **Last Modified:** Sep 11, 2026

## Description

Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.

## Affected Products

- Microsoft — Microsoft Exchange Server 2016 Cumulative Update 23 (15.01.0.0)
- Microsoft — Microsoft Exchange Server 2019 Cumulative Update 14 (15.02.0.0)
- Microsoft — Microsoft Exchange Server 2019 Cumulative Update 15 (15.02.0.0)
- Microsoft — Microsoft Exchange Server Subscription Edition RTM (15.02.0.0)

## References

- [CNA](https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.11%
- **EPSS Percentile:** 63.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._