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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Microsoft | Microsoft Exchange Server 2016 Cumulative Update 23 | 15.01.0.0 – < 15.01.2507.069 | 15.01.2507.069 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 14 | 15.02.0.0 – < 15.02.1544.041 | 15.02.1544.041 |
| Microsoft | Microsoft Exchange Server 2019 Cumulative Update 15 | 15.02.0.0 – < 15.02.1748.046 | 15.02.1748.046 |
| Microsoft | Microsoft Exchange Server Subscription Edition RTM | 15.02.0.0 – < 15.02.2562.043 | 15.02.2562.043 |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
atiilla/CVE-2026-42897 ★ 5 · May 15, 2026
CVE-2026-42897 - Exchange Health Checker blind spot: outbound IIS URL Rewrite rules silently ignored, making EOMT mitigations invisible in diagnostic reports.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 3
- MSRC-CVE-2026-42897 Microsoft Exchange Server Spoofing Vulnerability Microsoft Security Response Center · Jul 14, 2026
- WID-SEC-2026-1536 Microsoft Exchange Server: Schwachstelle ermöglicht Cross-Site-Scripting- und Spoofing-Angriffe BSI CERT-Bund (WID) · Jun 10, 2026
- NCSC-2026-0159 Kwetsbaarheid verholpen in Microsoft Exchange Server NCSC-NL (Netherlands) · May 15, 2026
References
- Microsoft Exchange Server Spoofing Vulnerability vendor-advisory patch