CVE-2026-42897
Last modified
CVE-2026-42897 is a medium-severity vulnerability rated 6.1/10 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.. CISA has confirmed active exploitation in the wild. EPSS estimates a 5.64% 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
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Exploitation Status
This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by .
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Microsoft | Exchange Server | 2016 |
| Microsoft | Exchange Server | 2019 |
| Microsoft | Exchange Server Subscription Edition | < 15.02.2562.043 |
References
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897Mitigation, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897US Government Resource
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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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.
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