CVE-2026-69356
CRITICALCVSS 9.3/10EPSS 0.70%
Last modified
CVE-2026-69356 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.
Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
Metrics
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | >= 15.01.0.0, < 15.01.2507.073 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | >= 15.02.0.0, < 15.02.1544.046 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | >= 15.02.0.0, < 15.02.1748.051 |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | >= 15.02.0.0, < 15.02.2562.049 |
References
Timeline
- Published
- Last Modified
- Status
- Awaiting Analysis
Frequently Asked Questions
What is CVE-2026-69356?
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Exchange Server allows an unauthorized attacker to perform spoofing over a network.
How severe is CVE-2026-69356?
CVE-2026-69356 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.
How do I fix CVE-2026-69356?
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.
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Are you affected by CVE-2026-69356?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST