CVE-2026-118527
Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability
Ivanti Connect Secure
Use of predictable filenames in Ivanti Connect Secure before versions 25.1.1.3 and 22.8R2.6 allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 30 October 2026. US federal agencies were required to remediate it by 13 November 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 0.8%, which is higher than 57.4% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Frequently asked questions
Is CVE-2026-118527 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-118527.
What does CVE-2026-118527 affect?
CVE-2026-118527 affects Ivanti Connect Secure. Use of predictable filenames in Ivanti Connect Secure before versions 25.1.1.3 and 22.8R2.6 allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk.
How severe is CVE-2026-118527?
CVE-2026-118527 is rated MEDIUM with a CVSS base score of 4.3. EPSS puts the probability of exploitation in the next 30 days at 0.8%, higher than 57.4% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 13 November 2026.
How should organisations respond to CVE-2026-118527?
Apply the vendor patch for Ivanti Connect Secure as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.