Ivanti Connect Secure zero-day exploited in the wild (CVE-2026-104935)

OverviewOn October 13, 2026, Ivanti published a security advisory for CVE-2026-104935, a high-severity authentication bypass by spoofing (CWE-290) affecting Ivanti Connect Secure (ICS). The vulnerability has a CVSSv3.0 score of 8.6 and allows a remote, unauthenticated attacker to execute arbitrary commands.Ivanti reports that exploitation in the wild has already occurred prior to disclosure, affecting a limited number of customers. This indicates that exploitation has been occurring as a zero-day vulnerability. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) confirms exploitation in the wild, and added CVE-2026-104935 to its Known Exploited Vulnerabilities (KEV) catalog on the same day as the vendor's public disclosure. The digital forensics firm Volexity has published a detailed blog post describing the threat actor activity, which was detected in early October 2026. Volexity notes that in addition to leveraging CVE-2026-104935 as a zero-day, the threat actor also leveraged an as-yet unpatched privilege escalation vulnerability which Ivanti are planning to patch at a later date.According to the vendor, a portion of the vulnerability was initially discovered throu…

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