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Microsoft Microsoft: Microsoft Exchange Server Cross-Site Scripting Vulnerability

› Microsoft Microsoft

last updated May 15, 2026

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started: May 15, 2026
closed: May 15, 2026
CVEs: 1
sources: 3

## summary

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. Added to CISA KEV on 2026-05-15.

severity: Actively exploited (CISA KEV)

## cve ids[1]

CVE-2026-42897

## affected

See vendor advisory / CISA notes (versions not always listed in KEV feed)

## fixed in

See vendor advisory linked in sources

## timeline[1]

May 15, 2026
CISA added CVE-2026-42897 to the KEV catalog (due 2026-05-29).

## advisories[3]

## notes & caveats

Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier).

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