CVE-2026-96940
HIGHDescription
An elevation of privilege vulnerability exists when Microsoft Exchange Outlook Web Access (OWA) fails to properly handle web requests. An attacker who successfully exploited this vulnerability could perform script/content injection attacks and attempt to trick the user into disclosing sensitive information. To exploit the vulnerability, an attacker could send a specially crafted email message containing a malicious link to a user. Alternatively, an attacker could use a chat client to social engineer a user into clicking the malicious link. The security update addresses the vulnerability by correcting how Microsoft Exchange validates web requests. Note: In order to exploit this vulnerability, a user must click a maliciously crafted link from an attacker.
How to fix
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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Exploit Intelligence
Moderate risk: more likely to be exploited than 41% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1390 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2026-55040 | Critical | 9.1 | 70% | KEV | Fix |
| CVE-2025-40554 | Critical | 9.8 | 61% | - | Fix |
| CVE-2025-40552 | Critical | 9.8 | 52% | - | Fix |
| CVE-2025-27740 | High | 8.8 | 3.5% | - | Fix |
| CVE-2024-49019 | High | 7.8 | 2.0% | - | Fix |
| CVE-2024-38239 | High | 7.2 | 1.7% | - | Fix |
Common questions
How do I fix CVE-2026-96940?
Published advisories record a fix for 4 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.
Is CVE-2026-96940 being actively exploited?
Not that we know of. CVE-2026-96940 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.50% is the estimated probability that it will be exploited in the next 30 days. That is higher than 41% of all scored CVEs.
How severe is CVE-2026-96940?
CVE-2026-96940 has a CVSS v3 base score of 8.8, rated important. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2026-96940 affect?
Published advisories record a fix for Microsoft Exchange Server 2016 Cumulative Update 23 (Microsoft), Microsoft Exchange Server 2019 Cumulative Update 14 (Microsoft), Microsoft Exchange Server 2019 Cumulative Update 15 (Microsoft), Microsoft Exchange Server Subscription Edition RTM (Microsoft). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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Markdown
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-08.