CVE-2026-42897
Exchange Server Cross-Site Scripting in Microsoft. CISA confirmed attackers exploit it and added it to its Known Exploited Vulnerabilities catalog on 15 May 2026.
- Product
- Microsoft
- Added to CISA's catalog
- Federal fix-by date
- Ransomware
- No known use in ransomware campaigns
- Vendor advisories
- Sources
- CISA’s catalog, NVD entry
CISA’s 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.
More from Microsoft this year.
- CVE-2026-96951 Command Injection, added
- CVE-2026-65660 Code Injection, added
- CVE-2026-85880 Heap-Based Buffer Overflow, added
- CVE-2026-81963 Link Following, added
- CVE-2019-1068 Remote Code Execution, added
- CVE-2026-55040 Weak Authentication, added
- CVE-2026-33824 Double Free, added
- CVE-2026-68820 Use-After-Free, added
Every flaw CISA confirmed exploited in the last 30 days is on the exploit watch. This is not security advice. Check the vendor’s advisory before acting. From CISA’s catalog of 4 November 2026.