CVE-2026-42018
JFrog Artifactory Improper Authentication Vulnerability
JFrog Artifactory
JFrog Artifactory could return an internal anonymous-user token to an unauthenticated caller when anonymous access is disabled, potentially exposing sensitive resources.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 11 September 2026. US federal agencies were required to remediate it by 25 September 2026.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 0.9%, which is higher than 58.5% 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:N/UI:N/S:U/C:H/I:N/A:N
Frequently asked questions
Is CVE-2026-42018 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2026-42018.
What does CVE-2026-42018 affect?
CVE-2026-42018 affects JFrog Artifactory. JFrog Artifactory could return an internal anonymous-user token to an unauthenticated caller when anonymous access is disabled, potentially exposing sensitive resources.
How severe is CVE-2026-42018?
CVE-2026-42018 is rated HIGH with a CVSS base score of 7.5. EPSS puts the probability of exploitation in the next 30 days at 0.9%, higher than 58.5% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 25 September 2026.
How should organisations respond to CVE-2026-42018?
Apply the vendor patch for JFrog Artifactory 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.