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CVE-20XX-?

CVE-2026-69378

7.5 HIGH 1% exploit odds Fix listed Denial of service Server

What it is

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

At a glance

Exploitability: Can be exploited over the network without logging in. High risk of service disruption.
Exploit odds: 1.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2026-09-08 18:18 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-09-29 15:54 UTC Last updatedMost recent change to the record

Details

Published: 2026-09-08 18:18 UTC
Last modified: 2026-09-29 15:54 UTC
Exploit probability: 1.2% · EPSS, next 30 days
Weakness: CWE-674
Record status: Analyzed

Affected

Microsoft Exchange Server 2016
Microsoft Exchange Server 2019
Microsoft Exchange Server Subscription Edition < 15.02.2562.049

Attack profile CVSS 3.1 · 7.5

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Meme: I wake up, CVE-2026-69378

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Fix and advisories

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378

NVD record · CVE.org record