Status: KEV | Advisory ID: CVE-2026-42897
| CVE | CVE-2026-42897 |
| Affected products | Microsoft Microsoft |
| Exploitation status | Listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, indicating confirmed active exploitation. |
| Classified as | CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) |
| KEV listing | Added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-05-15. |
| Exploitation prediction (EPSS) | 72% probability of exploitation in the next 30 days (99% percentile) -- FIRST.org's EPSS model. |
| Federal remediation deadline | 2026-05-29 (CISA KEV, Binding Operational Directive). |
Microsoft Exchange Server contains a cross-site scripting vulnerability during web page generation in Outlook Web Access and when certain interaction conditions are met, arbitrary JavaScript can be executed in the browser context.
| Source | Reference |
|---|---|
| NVD | https://nvd.nist.gov/vuln/detail/CVE-2026-42897 |