{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93861", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "state": "PUBLISHED", "assignerShortName": "mitre", "dateReserved": "2026-09-18T19:15:59.203Z", "datePublished": "2026-10-08T17:38:43.892Z", "dateUpdated": "2026-10-08T17:38:43.892Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mistral", "repo": "https://opendev.org/openstack/mistral", "vendor": "OpenStack", "versions": [{"lessThan": "20.1.1", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "21.0.1", "status": "affected", "version": "21.0.0", "versionType": "semver"}, {"lessThan": "22.0.1", "status": "affected", "version": "22.0.0", "versionType": "semver"}, {"status": "affected", "version": "23.0.0", "versionType": "semver"}]}], "descriptions": [{"lang": "en", "value": "In OpenStack Mistral through 23.0.0, the workflow membership API lets a project that has accepted a share of another project's private workflow create a further membership naming a third project. The new membership row is created with its project_id defaulted to the accepting project rather than the original workflow owner, and thus the owner can neither see nor delete it. The third project can accept this membership (that it had not actually been granted by the owner), and then read and execute the owner's private workflow; only the accepting (not the owning) project can later revoke that access."}], "metrics": [{"cvssV4_0": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "baseScore": 6, "baseSeverity": "MEDIUM", "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:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-863", "description": "CWE-863 Incorrect Authorization", "lang": "en", "type": "CWE"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-10-08T17:38:43.892Z"}, "references": [{"tags": ["issue-tracking"], "url": "https://launchpad.net/bugs/2161277"}, {"url": "https://security.openstack.org/ossa/OSSA-2026-044.html"}], "x_generator": {"engine": "CVE-Request-form 0.0.1"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Mistral", "repo": "https://opendev.org/openstack/mistral", "vendor": "OpenStack", "versions": [{"lessThan": "20.1.1", "status": "affected", "version": "0", "versionType": "semver"}, {"lessThan": "21.0.1", "status": "affected", "version": "21.0.0", "versionType": "semver"}, {"lessThan": "22.0.1", "status": "affected", "version": "22.0.0", "versionType": "semver"}, {"status": "affected", "version": "23.0.0", "versionType": "semver"}]}], "source": "cve@mitre.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In OpenStack Mistral through 23.0.0, the workflow membership API lets a project that has accepted a share of another project's private workflow create a further membership naming a third project. The new membership row is created with its project_id defaulted to the accepting project rather than the original workflow owner, and thus the owner can neither see nor delete it. The third project can accept this membership (that it had not actually been granted by the owner), and then read and execute the owner's private workflow; only the accepting (not the owning) project can later revoke that access."}], "id": "CVE-2026-93861", "lastModified": "2026-10-08T21:10:41.427", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.0, "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": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/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": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cve@mitre.org", "type": "Secondary"}]}, "published": "2026-10-08T18:18:31.153", "references": [{"source": "cve@mitre.org", "url": "https://launchpad.net/bugs/2161277"}, {"source": "cve@mitre.org", "url": "https://security.openstack.org/ossa/OSSA-2026-044.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-863"}], "source": "cve@mitre.org", "type": "Primary"}]}

{"acknowledgement": "Upstream acknowledges Chen YuXiang (Institute of Computing Technology, Chinese Academy of Sciences) as the original reporter.", "bugzilla": {"description": "openstack-mistral: mistral: workflow membership sub-delegation allows unauthorized access grant to private workflows", "id": "2544710", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544710"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N", "status": "draft"}, "cwe": "CWE-862", "details": ["A flaw was found in OpenStack Mistral. An authenticated project that has been granted and accepted access to another project's private workflow can further delegate that access to a third, arbitrary project without the workflow owner's knowledge or consent. The unauthorized delegation succeeds because the membership creation endpoint does not verify that the requesting project is the actual owner of the workflow. This allows an attacker to grant read and execution access to private workflows to projects the owner never authorized, and because the spurious membership record is stored under the delegating project's identity rather than the owner's, the owner cannot see or revoke it."], "mitigation": {"lang": "en:us", "value": "No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability."}, "name": "CVE-2026-93861", "package_state": [{"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Out of support scope", "package_name": "openstack-mistral", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Fix deferred", "package_name": "openstack-mistral", "product_name": "Red Hat OpenStack Platform 16.2"}], "public_date": "2026-10-08T19:17:47Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93861\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93861\nhttps://launchpad.net/bugs/2161277"], "statement": "Red Hat product impact analysis pending. Component mapping required to determine which products ship the affected code. OpenStack Mistral is shipped as part of Red Hat OpenStack Platform (RHOSP). Versions of RHOSP shipping Mistral versions <20.1.1, ==21.0.0, ==22.0.0, or ==23.0.0 are potentially affected. The vulnerability requires an authenticated OpenStack project that already holds an accepted workflow membership, so the attack surface is limited to deployments where the resource sharing feature is in use and authentication is enabled.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,20.1.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[21.0.0,21.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.0.0,22.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "23.0.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mistral", "source": "cna", "vendor": "OpenStack"}, "product": "mistral", "vendor": "openstack"}], "created": "2026-10-08T19:00:07.489780+00:00", "updated": "2026-10-09T03:15:15.730955+00:00", "vendors": ["openstack", "openstack$PRODUCT$mistral"]}