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Public proof of conceptFix available

CVE-2018-18850

A public proof of concept exists; no exploitation attested.

  • Published2018-10-31
  • Fixed in2018.9.1

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In Octopus Deploy 2018.8.0 through 2018.9.x before 2018.9.1, an authenticated user with permission to modify deployment processes could upload a maliciously crafted YAML configuration, potentially allowing for remote execution of arbitrary code, running in the same context as the Octopus Server (for self-hosted installations by default, SYSTEM).

Timeline

dates in UTC
  1. 2018-10-3103:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 03:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-18850?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-18850?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Octopus octopus server
BranchAffectedFixed in
2018.9≥ 2018.9.0, < 2018.9.12018.9.1
2018.8≥ 2018.8.0, ≤ 2018.8.12no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

  1. Update Octopus octopus server to 2018.9.1

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
1 moduleexploit/windows/http/octopusdeploy_deployrank: excellentModule metadata: Metasploit Framework, © Rapid7, Inc., BSD-3-Clause.
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2018-10-31
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2018-18850?

In Octopus Deploy 2018.8.0 through 2018.9.x before 2018.9.1, an authenticated user with permission to modify deployment processes could upload a maliciously crafted YAML configuration, potentially allowing for remote execution of arbitrary code, running in the same context as the Octopus Server (for self-hosted installations by default, SYSTEM).

Is CVE-2018-18850 actively exploited?

Active exploitation of CVE-2018-18850 has not been confirmed. Its EPSS score was 12.5% on 2026-11-02, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-18850?

CVE-2018-18850 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record