CVE-2026-91778
High
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductOctopus Server
PublishedSep 15, 2026
First seenSep 15, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- Octopus Deploy Octopus Server2026.1.11725, 2026.2.13344, 2026.3.11816 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Octopus Deploy Octopus Server | 2019.0.0 ≤ v < 2026.1.11725, 2026.2.0 ≤ v < 2026.2.13344, 2026.3.0 ≤ v < 2026.3.11816 | 2026.1.11725, 2026.2.13344, 2026.3.11816 |
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