CVE-2026-42897
Published: 14 May 2026
Summary
CVE-2026-42897 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Microsoft Exchange Server. Its CVSS base score is 8.1 (High).
Operationally, ranked in the top 6.0% of CVEs by exploit likelihood; CISA has added it to the Known Exploited Vulnerabilities catalog.
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.
Validates web inputs to reject script-related content that could produce XSS.
Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.
NVD 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.
Deeper analysisAI
Automated synthesis unavailable for this CVE.
Details
- CWE(s)
- KEV Date Added
- 15 May 2026