CVE-2026-91778 - Vulnerability Details - OpenCVE

In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact High

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.

The EPSS score is 0.00257.

Exploitation none

Automatable no

Technical Impact total

No data.

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://advisories.octopus.com/post/2026/sa2026-08

History

Tue, 15 Sep 2026 15:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Tue, 15 Sep 2026 07:30:00 +0000

Type	Values Removed	Values Added
Description		In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.
Weaknesses		CWE-863
References		https://advisories.octopus.com/post/2026/sa2026-08
Metrics		cvssV4_0 `{'score': 7.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: Octopus

Published: 2026-09-15T07:05:53.033Z

Updated: 2026-09-15T14:40:42.112Z

Reserved: 2026-09-15T01:38:15.839Z

Link: CVE-2026-91778

Vulnrichment

Updated: 2026-09-15T14:40:07.249Z

NVD

Status : Received

Published: 2026-09-15T08:17:07.180

Modified: 2026-09-15T15:17:32.047

Link: CVE-2026-91778

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

CWE-863

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-91778", "assignerOrgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "state": "PUBLISHED", "assignerShortName": "Octopus", "dateReserved": "2026-09-15T01:38:15.839Z", "datePublished": "2026-09-15T07:05:53.033Z", "dateUpdated": "2026-09-15T14:40:42.112Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "shortName": "Octopus", "dateUpdated": "2026-09-15T07:08:54.502Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization", "type": "CWE"}]}], "affected": [{"vendor": "Octopus Deploy", "product": "Octopus Server", "platforms": ["Windows", "Linux"], "versions": [{"status": "affected", "version": "2019.0.0", "lessThan": "2026.1.11725", "versionType": "custom"}, {"status": "affected", "version": "2026.2.0", "lessThan": "2026.2.13344", "versionType": "custom"}, {"status": "affected", "version": "2026.3.0", "lessThan": "2026.3.11816", "versionType": "custom"}], "defaultStatus": "unaffected"}], "descriptions": [{"lang": "en", "value": "In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation."}]}], "references": [{"url": "https://advisories.octopus.com/post/2026/sa2026-08"}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "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": "HIGH", "baseScore": 7.2, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"}}], "credits": [{"lang": "en", "value": "This vulnerability was found by Nathan Willoughby", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.5"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-15T14:39:41.923720Z", "id": "CVE-2026-91778", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-15T14:40:42.112Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-91778", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-09-15T14:39:41.923720Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-15T14:40:07.249Z"}}], "cna": {"source": {"discovery": "INTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "This vulnerability was found by Nathan Willoughby"}], "metrics": [{"format": "CVSS", "cvssV4_0": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 7.2, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "HIGH", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N", "exploitMaturity": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "userInteraction": "NONE", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Octopus Deploy", "product": "Octopus Server", "versions": [{"status": "affected", "version": "2019.0.0", "lessThan": "2026.1.11725", "versionType": "custom"}, {"status": "affected", "version": "2026.2.0", "lessThan": "2026.2.13344", "versionType": "custom"}, {"status": "affected", "version": "2026.3.0", "lessThan": "2026.3.11816", "versionType": "custom"}], "platforms": ["Windows", "Linux"], "defaultStatus": "unaffected"}], "references": [{"url": "https://advisories.octopus.com/post/2026/sa2026-08"}], "x_generator": {"engine": "Vulnogram 1.0.5"}, "descriptions": [{"lang": "en", "value": "In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.", "supportingMedia": [{"type": "text/html", "value": "In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation.", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-863", "description": "CWE-863: Incorrect Authorization"}]}], "providerMetadata": {"orgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "shortName": "Octopus", "dateUpdated": "2026-09-15T07:08:54.502Z"}}}, "cveMetadata": {"cveId": "CVE-2026-91778", "state": "PUBLISHED", "dateUpdated": "2026-09-15T14:40:42.112Z", "dateReserved": "2026-09-15T01:38:15.839Z", "assignerOrgId": "6f4f8c89-ef06-4bae-a2a5-6734ddf76272", "datePublished": "2026-09-15T07:05:53.033Z", "assignerShortName": "Octopus"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["Windows", "Linux"], "product": "Octopus Server", "vendor": "Octopus Deploy", "versions": [{"lessThan": "2026.1.11725", "status": "affected", "version": "2019.0.0", "versionType": "custom"}, {"lessThan": "2026.2.13344", "status": "affected", "version": "2026.2.0", "versionType": "custom"}, {"lessThan": "2026.3.11816", "status": "affected", "version": "2026.3.0", "versionType": "custom"}]}], "source": "security@octopus.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In affected versions of Octopus Server, users with certain scoped permission sets could execute arbitrary scripts on a worker (including the Octopus Server built-in worker). Incorrect permission validation during script execution would allow the script to execute without the user possessing the required authorisation."}], "id": "CVE-2026-91778", "lastModified": "2026-09-15T15:17:32.047", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.2, "baseSeverity": "HIGH", "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": "LOW", "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:L/UI:N/VC:N/VI:H/VA:H/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": "HIGH", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@octopus.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-91778", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-15T14:39:41.923720Z", "version": "2.0.3"}}]}, "published": "2026-09-15T08:17:07.180", "references": [{"source": "security@octopus.com", "url": "https://advisories.octopus.com/post/2026/sa2026-08"}], "sourceIdentifier": "security@octopus.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "security@octopus.com", "type": "Secondary"}]}