CVE-2026-42897
Act now ● On CISA KEV — actively exploited
Actively exploited — on the CISA KEV list.
CVSS base
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EPSS — probability of exploitation (30 days)
71.8%
99.4th percentile
CISA KEV
Listed
Added 2026-05-15 · patch by 2026-05-29
Weakness / dates
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Published — · modified —
Timeline
- 2026-05-15 — Added to CISA KEV (actively exploited)
- 2026-05-29 — CISA patch-by deadline
Description
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.