CVE-2026-112305
Semaphore UI through 2.19.16 RCE via Task Environment Ansible Variable Override
- State
- Published
- Severity
- 8.7 High
- Published
- Oct 19, 2026
- Updated
- Oct 19, 2026
- Reserved
- Oct 19, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.7 High | 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 | VulnCheck |
| 3.1 | 8.8 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-915 Improperly Controlled Modification of Dynamically-Determined Object Attributes
Affected Products
| Product | Versions |
|---|---|
Semaphore UIsemaphoreui |
|
References
- https://github.com/semaphoreui/semaphore/pull/3888issue-trackingtechnical-descriptionpatch
- https://github.com/semaphoreui/semaphore/blob/v2.19.16/services/tasks/TaskRunner.go#L395-L431technical-description
- https://github.com/semaphoreui/semaphore/blob/v2.19.16/api/projects/tasks.go#L39-L75technical-description
- https://github.com/semaphoreui/semaphoreproduct
- VulnCheck Advisory: Semaphore UI through 2.19.16 RCE via Task Environment Ansible Variable Overridethird-party-advisory
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