CVE-2026-91778

Published Sep 15, 2026 CVSS 4.0 · 7.2 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Octopus
Octopus octopus Server
Vendors & Products Octopus
Octopus octopus Server
Type Values Removed Values Added
Title Arbitrary Script Execution via Permission Validation Bypass in Octopus Server
Type Values Removed Values Added
Title Arbitrary Script Execution via Permission Validation Bypass in Octopus Server
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Weaknesses CWE-863
References
Metrics cvssV4_0

{'score': 7.2, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Octopus
Published
Updated
Sep 15, 2026, 2:40 PM
Reserved
Sep 15, 2026, 1:38 AM
Status
Awaiting Analysis
Published
Sep 15, 2026, 8:17 AM
Modified
Sep 16, 2026, 7:41 PM