Vulnerability in Semaphoreui Semaphore Ui
CVE-2026-112305
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.
Vulnerability class: Mass Assignment
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/semaphoreui/semaphore/pull/3888 (issue-tracking, technical-description, patch)
- github.com/semaphoreui/semaphore/blob/v2.19.16/services/tasks/TaskRunner.go (technical-description)
- github.com/semaphoreui/semaphore/blob/v2.19.16/api/projects/tasks.go (technical-description)
- github.com/semaphoreui/semaphore (product)
- www.vulncheck.com/advisories/semaphore-ui-through-2.19.16-rce-via-task-environm… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-112305?
- CVE-2026-112305 is a high-severity vulnerability in Semaphoreui Semaphore Ui, classified under Improperly Controlled Modification of Dynamically-Determined Object Attributes. CVSS score: 8.8/10. Published 2026-10-19.
- How severe is CVE-2026-112305?
- High severity. CVSS v3 base score is 8.8 out of 10.