All vulnerabilities
CVE-2026-12887

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.

Octopus Deploy Octopus Server
Open in ThreatlineRecord JSON
CVSS
5.1Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)No scoreNo FIRST EPSS score in this snapshot yet
Fixed in2026.1.674Also 2026.2.973, 2026.3.5839CVE List
Published27 Oct 2026Updated 27 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Affected versions 4

  • Octopus Serveraffected: 2023.0.0 before 2026.1.674CVE List
  • Octopus Serveraffected: 2026.1 before 2026.1.674CVE List
  • Octopus Serveraffected: 2026.2 before 2026.2.973CVE List
  • Octopus Serveraffected: 2026.3 before 2026.3.5839CVE List

References 1