Published Sep 16, 2026Sources checked Oct 27, 2026
9.3CRITICALCVSS out of 10
What this means
Review the available evidence
CVE-2026-15639 and is rated Critical severity with a CVSS score of 9.3. It is not in the current CISA KEV record we collected. That does not prove exploitation has not occurred.
What to do next
Remediation and response
Delinea Security Advisories guidance
Vendor revision: Sep 15, 2026
Vendor-listed releases
- Upgrade to secret server version 12.0.20 or later.
CISA KEVNot listedBased on the latest collected catalog
EPSS0.4%Estimated 30-day exploitation probability
Ransomware useNot markedCISA KEV ransomware field
Threat actors0Source-linked actor relationships
Overview
What is CVE-2026-15639?
An attacker can craft a malicious link that, if used by a legitimate user, may cause the user's browser to run JavaScript supplied by the attacker.