CVE-2026-91778: CWE-863: Incorrect Authorization in Octopus Deploy Octopus Server
CVE-2026-91778 is a high-severity vulnerability in Octopus Deploy's Octopus Server where users with certain scoped permissions can execute arbitrary scripts on a worker without proper authorization. This occurs due to incorrect permission validation during script execution, allowing actions beyond the user's intended privileges.
AI Analysis
Technical Summary
In affected versions of Octopus Server, an authorization bypass vulnerability (CWE-863) exists that permits users with specific scoped permission sets to execute arbitrary scripts on a worker, including the built-in Octopus Server worker. The flaw arises from improper permission validation during script execution, enabling script execution without the user having the required authorization. This can lead to unauthorized code execution within the Octopus Server environment.
Potential Impact
The vulnerability allows users with limited scoped permissions to run arbitrary scripts on Octopus Server workers, potentially leading to unauthorized code execution and privilege escalation within the server environment. This could compromise the integrity and security of deployments managed by Octopus Server.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict user permissions to the minimum necessary and monitor for unusual script execution activities.
CVE-2026-91778: CWE-863: Incorrect Authorization in Octopus Deploy Octopus Server
Description
CVE-2026-91778 is a high-severity vulnerability in Octopus Deploy's Octopus Server where users with certain scoped permissions can execute arbitrary scripts on a worker without proper authorization. This occurs due to incorrect permission validation during script execution, allowing actions beyond the user's intended privileges.
CVSS v4.0
Score 7.2high
Affected software
Octopus Deploy
Octopus Server
pkg:github/octopusdeploy/octopusserverRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In affected versions of Octopus Server, an authorization bypass vulnerability (CWE-863) exists that permits users with specific scoped permission sets to execute arbitrary scripts on a worker, including the built-in Octopus Server worker. The flaw arises from improper permission validation during script execution, enabling script execution without the user having the required authorization. This can lead to unauthorized code execution within the Octopus Server environment.
Potential Impact
The vulnerability allows users with limited scoped permissions to run arbitrary scripts on Octopus Server workers, potentially leading to unauthorized code execution and privilege escalation within the server environment. This could compromise the integrity and security of deployments managed by Octopus Server.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict user permissions to the minimum necessary and monitor for unusual script execution activities.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Octopus
- Date Reserved
- 2026-09-15T01:38:15.839Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6aa8f48155bf5e2cf562153c
Added to database: 09/15/2026, 07:32:17 UTC
Last enriched: 09/15/2026, 07:46:27 UTC
Last updated: 09/15/2026, 07:59:30 UTC
Views: 5
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
External Links
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.