CVE-2026-69378
HIGHCVSS 7.5/10EPSS 1.20%
Last modified
CVE-2026-69378 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.. EPSS estimates a 1.20% chance of exploitation in the next 30 days.
Description
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Exchange Server | 2016 | Cumulative Update 23 |
| Microsoft | Exchange Server | 2019 | Cumulative Update 14 |
| Microsoft | Exchange Server Subscription Edition | < 15.02.2562.049 | — |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69378Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2026-69378?
Uncontrolled recursion in Microsoft Exchange Server allows an unauthorized attacker to deny service over a network.
How severe is CVE-2026-69378?
CVE-2026-69378 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.20% probability of exploitation in the next 30 days.
How do I fix CVE-2026-69378?
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.
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Are you affected by CVE-2026-69378?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST