CVE-2026-42897

Known Exploited Vulnerability Entry External Catalog

Back to Catalog View Vulnerability
Entry Details

CVE-2026-42897

Confirmed

Yes

2026-05-15 00:00 UTC

Timestamps

2026-05-15

2026-05-15

Scope

KEV entry: Microsoft Exchange Server Cross-Site Scripting Vulnerability | Affected: Microsoft / Microsoft | 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. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-05-29 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-42897 ; https://learn.microsoft.com/en-us/exchange/plan-and-deploy/post-installation-tasks/security-best-practices/exchange-emergency-mitigation-service ; https://nvd.nist.gov/vuln/detail/CVE-2026-42897

References
  • {'id': 'CVE-2026-42897', 'url': 'https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2026-42897'}

856ec6df-cb8a-4f6c-a72c-2f0c1e75f16d

405284c2-e461-4670-8979-7fd2c9755a60

2026-05-15 18:00 UTC

2026-05-15 18:00 UTC

Evidence (1)
Type Source Signal Confidence Details GCVE Metadata
vendor_report cisa-kev successful_exploitation 0.80
View details 
{
  "cwes": [
    "CWE-79"
  ],
  "date_added": "2026-05-15",
  "due_date": "2026-05-29",
  "feed": "CISA Known Exploited Vulnerabilities Catalog",
  "knownRansomwareCampaignUse": "Unknown",
  "product": "Microsoft",
  "vendorProject": "Microsoft",
  "vulnerabilityName": "Microsoft Exchange Server Cross-Site Scripting Vulnerability"
}
 -
Export Options
JSON Object JSON API View Full Catalog