CVE-2026-101169

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-29 · updated 2026-09-29
Weakness: CWE-502

Description

In affected versions of Octopus Server, an authenticated user with permissions to edit an Environment or Project can set specifically crafted JSON content for the object. Insecure deserialization of this content allows the user to execute arbitrary code in the Octopus Server process.

Affected products

Octopus Deploy Octopus Server: from 2019.4.1 before 2026.1.11781; from 2026.2.0 before 2026.2.13441; from 2026.3.0 before 2026.3.15829 — fixed in 2026.1.11781, 2026.2.13441, 2026.3.15829

How to fix

Upgrade to a fixed version: Octopus Deploy Octopus Server 2026.1.11781, 2026.2.13441, 2026.3.15829. Check the vendor advisory for mitigations.

References

https://advisories.octopus.com/post/2026/sa2026-10

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