CVE-2026-12887

Out-of-Directory Script Execution via Malicious NuGet Packages on Octopus Server

Published Oct 27, 2026 CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Description
In affected versions of Octopus Server, a user with permission to upload a malicious nuget package is able to deploy a script step so the script executes outside of the parent directory.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
First Time appeared Octopus
Octopus octopus Server
Vendors & Products Octopus
Octopus octopus Server
Type Values Removed Values Added
Title Out-of-Directory Script Execution via Malicious NuGet Packages on Octopus Server
Weaknesses CWE-22
CWE-264
Type Values Removed Values Added
Description In affected versions of Octopus Server, a user with permission to upload a malicious nuget package is able to deploy a script step so the script executes outside of the parent directory.
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Octopus
Published
Updated
Nov 4, 2026, 5:17 PM
Reserved
Jun 22, 2026, 10:55 AM
Status
Awaiting Analysis
Published
Oct 27, 2026, 2:17 PM
Modified
Nov 4, 2026, 6:17 PM