CVE-2026-112305: high-severity vulnerability in semaphoreui Semaphore UI
Semaphore UI through 2.19.16 RCE via Task Environment Ansible Variable Override
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 8.7epss 0.6%
Semaphore UI through 2.19.16 contains a remote code execution vulnerability that allows users with the task_runner role to override protected Ansible variables by supplying arbitrary keys in the task environment JSON. Attackers can POST tasks setting ansible_ssh_common_args with a ProxyCommand or ansible_connection=local to execute commands as the Semaphore server user, exposing encryption keys, SSH keys and stored secrets.
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
semaphoreui · Semaphore UIReferences
https://github.com/semaphoreui/semaphorehttps://github.com/semaphoreui/semaphore/blob/v2.19.16/api/projects/tasks.go#L39-L75https://github.com/semaphoreui/semaphore/blob/v2.19.16/services/tasks/TaskRunner.go#L395-L431https://github.com/semaphoreui/semaphore/pull/3888https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.16-rce-via-task-environment-ansible-variable-override