CVE-2026-112305
Semaphore UI through 2.19.16 RCE via Task Environment Ansible Variable Override
CVSS Score
8.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-915 |
| Vendor | semaphoreui |
| Product | semaphore ui |
| Published | Oct 19, 2026 |
| Last Updated | Oct 19, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
semaphoreui / Semaphore UI
0 ≤ 2.19.16
References
github.com: https://github.com/semaphoreui/semaphore/pull/3888 github.com: https://github.com/semaphoreui/semaphore/blob/v2.19.16/services/tasks/TaskRunner.go#L395-L431 github.com: https://github.com/semaphoreui/semaphore/blob/v2.19.16/api/projects/tasks.go#L39-L75 github.com: https://github.com/semaphoreui/semaphore vulncheck.com: https://www.vulncheck.com/advisories/semaphore-ui-through-2.19.16-rce-via-task-environment-ansible-variable-override
Credits
aditya-manit Zachariah Mithani