TI-2026-81153 Aliases CVE-2026-12887 GHSA-7cvm-rc3q-qjrq

Path traversal in Octopus Server lets uploaders run scripts outside directory

LOW 23CWE-22Published 2026-10-27 · Updated 2026-11-04

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: —
Confidentiality · integrity · availability: None · Low · Low
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Octopus Server versions from 2023.0.0 before 2026.1.674, from 2026.1 before 2026.1.674, from 2026.2 before 2026.2.973, and from 2026.3 before 2026.3.5839 are affected. A user with permission to upload a NuGet package can deploy a script step so that the script runs outside the parent directory, which is a path traversal flaw (CWE-22). An attacker needs high privileges and the impact is limited to low integrity and availability loss.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00313 24th percentileScored 2026-11-07

Fix Fixed Octopus Server (Octopus Deploy): 2026.1.674, 2026.2.973, 2026.3.5839

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Octopus Deploy	Octopus Server	2023.0.0 to before 2026.1.674; 2026.1 to before 2026.1.674; 2026.2 to before 2026.2.973; 2026.3 to before 2026.3.5839	2026.1.674, 2026.2.973, 2026.3.5839	Patch available	CNA

Octopus Server VendorOctopus Deploy Affected 2023.0.0 to before 2026.1.674; 2026.1 to before 2026.1.674; 2026.2 to before 2026.2.973; 2026.3 to before 2026.3.5839 Fixed in 2026.1.674, 2026.2.973, 2026.3.5839 Patch available CNA

Remediation

Upgrade Octopus Server to 2026.1.674, 2026.2.973, or 2026.3.5839, or a later version of the same branch.

Written with Claude Haiku 5.5 from the sources below · 2026-11-04

Fix · CNA Octopus Server (Octopus Deploy) Fixed in 2026.1.674, 2026.2.973, 2026.3.5839

Timeline

2026-10-27 Threatist record created from CVE-2026-12887
2026-10-27 Alias added: GHSA-7cvm-rc3q-qjrq
2026-11-04 Weakness changed · CISA ADP
2026-11-04 CISA SSVC decision points changed

References

Other 1

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

TI-2018-13353 In Octopus Deploy 2018.8.0 through 2018.9.x before 2018.9.1, an authenticated user with… CVSS 3.0HIGH 8.8
TI-2022-02375 Improper authentication in Octopus Server CVSS 3.1CRITICAL 9.8
TI-2022-02579 Insufficient session expiration in Octopus Server CVSS 3.1CRITICAL 9.1
TI-2021-11816 Deserialization of untrusted data in Octopus Deploy Halibut CVSS 3.1CRITICAL 9.8
TI-2018-08066 In Octopus Deploy 2018.4.4 through 2018.5.1, Octopus variables that are sourced from the… CVSS 3.0CRITICAL 9.8
TI-2022-02575 In affected versions of Octopus Deploy it is possible to bypass rate limiting on login using null bytes. CVSS 3.1CRITICAL 9.8

See all 117 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences