Vulnerability · Published Oct 27, 2026 · Assigned by Octopus
CVE-2026-12887
Medium 5.1
In plain English
A medium-severity path traversal in Octopus Server from Octopus Deploy. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Severity (CVSS 4.0)5.1Medium
Exploit odds (30 days)0.3%top 75.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Octopus Deploy | Octopus Server | 2023.0.0 – before 2026.1.6742026.1 – before 2026.1.6742026.2 – before 2026.2.9732026.3 – before 2026.3.5839 |
Weakness: CWE-22 · 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