CVE-2026-12887 PUBLISHED

Assigner: Octopus
Reserved: 22.06.2026 Published: 27.10.2026 Updated: 27.10.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 5.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	Low	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	Octopus Deploy
Product	Octopus Server
Versions	Default: unaffected affected from 2023.0.0 to 2026.1.674 (excl.) affected from 2026.1 to 2026.1.674 (excl.) affected from 2026.2 to 2026.2.973 (excl.) affected from 2026.3 to 2026.3.5839 (excl.)

Credits

This vulnerability was found by siddharthkathole62bb60 finder

References

https://advisories.octopus.com/post/2026/sa2026-14/

Problem Types

Path Traversal in Octopus Server