CVE-2026-93861
published 2026-10-08CVE-2026-93861: 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…
PriorityP335medium6CVSS 4.0
AVNACLATPPRLUINVCHVINVANSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
EPSS
0.26%
16.5th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| openstack | mistral | < 20.1.1 | 20.1.1 |
| openstack | mistral | — | — |
| openstack | mistral | >= 21.0.0 < 21.0.1 | 21.0.1 |
| openstack | mistral | >= 22.0.0 < 22.0.1 | 22.0.1 |
| redhat | openstack-mistral | — | — |
CVSS provenance
nvdv4.06.0MEDIUMCVSS: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
vendor_redhat6.0MEDIUM
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Red Hat
openstack-mistral: mistral: workflow membership sub-delegation allows unauthorized access grant to private workflows
vendor_redhat·2026-10-08·CVSS 6.0
CVE-2026-93861 [MEDIUM] CWE-862 openstack-mistral: mistral: workflow membership sub-delegation allows unauthorized access grant to private workflows
openstack-mistral: mistral: workflow membership sub-delegation allows unauthorized access grant to private workflows
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 rev
GHSA
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.
ghsa_unreviewed·2026-10-08
CVE-2026-93861 [MEDIUM] CWE-863 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.
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.
No detection rules found.
No public exploits indexed.
2026-10-08
Published