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CVE-2026-93861

MEDIUM 6

Published 2026-10-08 · Last modified 2026-10-15

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 EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 17th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

6CVSS 4.0 · MEDIUM

  • ConfidentialityHigh
  • IntegrityNone
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ⚠Requirements: Specific conditions must be present

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Openstack

Products Mistral

Weakness (CWE)

  • CWE-863: Incorrect Authorization

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • openstack-mistral-all as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-all

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-api as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-api

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-common as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-common

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-engine as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-engine

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-event-engine as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-event-engine

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-executor as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-executor

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral.src as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral?arch=src

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • python-mistral as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-mistral

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • python-mistral-tests as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-mistral-tests

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-all as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-all

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-api as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-api

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-common as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-common

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-engine as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-engine

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-event-engine as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-event-engine

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-executor as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-executor

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • openstack-mistral-notifier as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-notifier

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00
  • python3-mistral as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python3-mistral

    • workaround: No mitigation is currently available that meets Red Hat Product Security's standards for usability, deployment, applicability, or stability.
    • none available: Fix deferred
    Red Hat · CVE-2026-93861 · Updated 2026-10-08T23:35:50+00:00

All CVSS metrics

  • MEDIUM 6 v4.0 · CNA Primary
    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
  • MEDIUM 6 v4.0 · NVD Secondary
    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

References

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS