CVE-2026-12887 - Vulnerability Details - OpenCVE

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.

Attack Vector Network

Attack Complexity Low

Privileges Required High

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Octopus	Octopus Server

No data.

No data.

References

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

History

Wed, 28 Oct 2026 22:15:00 +0000

Type	Values Removed	Values Added
First Time appeared		Octopus Octopus octopus Server
Vendors & Products		Octopus Octopus octopus Server

Tue, 27 Oct 2026 15:00:00 +0000

Type	Values Removed	Values Added
Title		Out-of-Directory Script Execution via Malicious NuGet Packages on Octopus Server
Weaknesses		CWE-22 CWE-264

Tue, 27 Oct 2026 13:45:00 +0000

Type	Values Removed	Values Added
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.
References		https://advisories.octopus.com/post/2026/sa2026-14/
Metrics		cvssV4_0 `{'score': 5.1, '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'}`

MITRE

Status: PUBLISHED

Assigner: Octopus

Published: 2026-10-27T13:15:22.608Z

Updated: 2026-10-27T13:15:22.608Z

Reserved: 2026-06-22T10:55:01.254Z

Link: CVE-2026-12887

Vulnrichment

No data.

NVD

Status : Awaiting Analysis

Published: 2026-10-27T14:17:00.590

Modified: 2026-10-27T15:08:50.630

Link: CVE-2026-12887

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-12887", "assignerOrgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "state": "PUBLISHED", "assignerShortName": "Octopus", "dateReserved": "2026-06-22T10:55:01.254Z", "datePublished": "2026-10-27T13:15:22.608Z", "dateUpdated": "2026-10-27T13:15:22.608Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "shortName": "Octopus", "dateUpdated": "2026-10-27T13:15:22.608Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "description": "Path Traversal in Octopus Server"}]}], "affected": [{"vendor": "Octopus Deploy", "product": "Octopus Server", "platforms": ["Windows", "Linux"], "versions": [{"status": "affected", "version": "2023.0.0", "lessThan": "2026.1.674", "versionType": "custom"}, {"status": "affected", "version": "2026.1", "lessThan": "2026.1.674", "versionType": "custom"}, {"status": "affected", "version": "2026.2", "lessThan": "2026.2.973", "versionType": "custom"}, {"status": "affected", "version": "2026.3", "lessThan": "2026.3.5839", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "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."}]}], "references": [{"url": "https://advisories.octopus.com/post/2026/sa2026-14/"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "HIGH", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "MEDIUM", "baseScore": 5.1, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "This vulnerability was found by siddharthkathole62bb60", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Windows", "Linux"], "product": "Octopus Server", "vendor": "Octopus Deploy", "versions": [{"lessThan": "2026.1.674", "status": "affected", "version": "2023.0.0", "versionType": "custom"}, {"lessThan": "2026.1.674", "status": "affected", "version": "2026.1", "versionType": "custom"}, {"lessThan": "2026.2.973", "status": "affected", "version": "2026.2", "versionType": "custom"}, {"lessThan": "2026.3.5839", "status": "affected", "version": "2026.3", "versionType": "custom"}]}], "source": "security@octopus.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-12887", "lastModified": "2026-10-27T15:08:50.630", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 5.1, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "HIGH", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "LOW", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "LOW", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@octopus.com", "type": "Secondary"}]}, "published": "2026-10-27T14:17:00.590", "references": [{"source": "security@octopus.com", "url": "https://advisories.octopus.com/post/2026/sa2026-14/"}], "sourceIdentifier": "security@octopus.com", "vulnStatus": "Awaiting Analysis"}