CVE-2026-42897
MEDIUM CISA KEV EPSS 92.0%
Published May 14, 20261mo ago · Modified Jun 17, 20261w ago
6.1 CVSS 3.1
Published May 14, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago
KEV Listed May 15, 2026 1mo ago
KEV Due May 29, 2026 32d overdue
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Low
Availability None
Threat Intelligence
CISA Known Exploited Overdue 32d
- Added
- May 15, 2026
- Due
- May 29, 2026
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS Exploit Probability
92.0% percentile
Exploit & Patch Status
Actively Exploited (KEV)
No Patch Available
Weaknesses 1
CWE-79 Cross-site Scripting Injection
Affected Products 40
| Vendor | Product | Version | Range |
|---|---|---|---|
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2016 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server | 2019 | any |
| microsoft | exchange_server_subscription_edition | * | <15.02.2562.043 |
References 2
- msrc.microsoft.com https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.