CVE-2026-91778 Missing authorization in Octopus Server
Users with scoped permissions can execute arbitrary scripts on workers due to incorrect permission validation, leading to code execution and privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91778?
CVE-2026-91778 is a high-severity missing authorization vulnerability in Octopus Server, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-91778?
How do I fix CVE-2026-91778?
No fix has been published for CVE-2026-91778 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-91778 being exploited?
There is no known exploitation of CVE-2026-91778 in the wild and no public exploit code.
Sources
Also known as GHSA-9wjw-f37c-vj83.