CVE-2026-42897 KEV
8.1
HIGH · CVSS 3.1 · EPSS 0.5% (pctl 42)
Patch first
On CISA KEV — known exploited in the wild, due 2026-05-29.
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.
Scoring
| CVSS | 8.1 (HIGH, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |
| EPSS | 0.52% — more likely to be exploited than 42% of all CVEs |
| Weakness | CWE-79 |
| On CISA KEV | yes — remediate by 2026-05-29 |
| Public exploit | none known |
| Published | 2026-05-14 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Microsoft Exchange Server Cross-Site Scripting Vulnerability |
|---|---|
| Added | 2026-05-15 |
| Due | 2026-05-29 |
| Vendor / product | Microsoft / Microsoft |
| Ransomware use | none reported |
Affected (2)
| Vendor | Product |
|---|---|
| microsoft | exchange server |
| microsoft | exchange server subscription edition |
References
→ the Explorer · watch your stack · NVD