# CVE-2026-91778

## Summary

- **CVE ID:** CVE-2026-91778
- **Severity:** HIGH
- **CVSS Score:** 7.2 (CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-863
- **Published:** Sep 15, 2026
- **Last Modified:** Sep 15, 2026

## 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.

## Affected Products

- Octopus Deploy — Octopus Server (2019.0.0)
- Octopus Deploy — Octopus Server (2026.2.0)
- Octopus Deploy — Octopus Server (2026.3.0)

## References

- [CNA](https://advisories.octopus.com/post/2026/sa2026-08)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 17.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._