CVE-2026-91778
HighCVSS 7.2Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker, including the built-in worker. Incorrect permission validation during script execution allowed the script to run without the user having the required authorization.
Risk Assessment
Risk of unauthorized code execution on the server, potentially leading to system compromise and data integrity issues.
Recommendation
Upgrade Octopus Server to the latest version that includes a fix. Review and restrict user permission sets to minimize risk.
Other vulnerabilities in Octopus Server
See all- CVE-2026-92355High
In affected versions of Octopus Server, a user with permission to modify non built-in external feeds could exploit a path traversal flaw to overwrite arbitrary files on the server, potentially leading to remote code execution in some configurations.
- CVE-2026-14163High
In affected versions of Octopus Server, sensitive variables may be printed in clear-text in the deployment variable snapshot under certain circumstances.
- CVE-2026-8296Medium
In affected versions of Octopus Server with certain access levels it was possible to embed a Cross-Site Scripting Payload via artifacts.
- CVE-2026-4881Medium
In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make server level changes using a certain API endpoint despite receiving an error.
Original NVD description (English source)
In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS