{"id":"CVE-2026-42897","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-42897","generatedAt":"2026-10-28T02:13:32.453Z","title":"Microsoft Exchange Server Cross-Site Scripting Vulnerability","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.","published":"2026-05-14T18:16:49.000Z","lastModified":"2026-10-26T14:10:00.000Z","status":"Analyzed","sourceIdentifier":"secure@microsoft.com","cvss":{"version":"3.1","score":6.1,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":["microsoft/exchange server","microsoft/exchange server subscription edition"],"epss":{"score":0.70662,"percentile":0.9939,"date":"2026-10-26","history":[{"date":"2026-09-24","score":0.00519,"percentile":0.41619},{"date":"2026-10-25","score":0.70662,"percentile":0.99389}]},"kev":{"listed":true,"dateAdded":"2026-05-15","dueDate":"2026-05-29","knownRansomwareCampaignUse":"Unknown","notes":"Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.\nhttps://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"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 29 May 2026). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[{"kind":"epss","label":"EPSS jump","at":"2026-10-25T00:00:00.000Z","detail":{"to":0.70662,"from":0.00519,"percentile":0.99389},"summary":"EPSS moved from 0.5% to 70.7% probability of exploitation in the next thirty days."},{"kind":"epss","label":"EPSS jump","at":"2026-09-24T00:00:00.000Z","detail":{"to":0.00519,"from":0.71766,"percentile":0.41619},"summary":"EPSS moved from 71.8% to 0.5% probability of exploitation in the next thirty days."}],"references":[{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42897","tags":["Mitigation","Vendor Advisory"],"source":"secure@microsoft.com"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42897","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-42897","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}