# CVE-2026-76878: CVE-2026-76878

Status: published. Published: 2026-08-19. Updated: 2026-11-12.

In OpenStack Aodh before 22.0.1, the alarm list API bypasses project scoping when the all_projects query parameter is set to false. The API checks for the presence of the all_projects key rather than its value; a true value enforces the administrator-only policy, but a false value removes the key and skips the branch that normally restricts results to the caller's project. A non-admin user with the reader role can list alarms from all projects, exposing alarm actions containing trust webhook URLs, Heat signal endpoints, project IDs, and user IDs. The parameter can also be combined with a foreign project_id to target a specific project's alarms. A related concern is that OpenStack Watcher does not apply authorization to its webhook trigger endpoint. Any authenticated user who learns an audit's webhook URL, for example from this leaked Aodh alarm metadata, can start an EVENT audit and its associated action plan regardless of their own project or role. The webhook endpoint has lacked policy enforcement since its introduction in the Ussuri release (Watcher 4.0.0).

## Remediation

No remediation reported in collected sources

## Affected products and versions

- OpenStack / Aodh: ≥ 10.0.0; < 20.0.1 (affected, semver); ≥ 21.0.0; < 21.0.1 (affected, semver); ≥ 22.0.0; < 22.0.1 (affected, semver). Source: CNA: mitre

## Severity and prioritization

- CVSS 4.0: 8.4 (high); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:L/SI:H/SA:L; source: CNA: mitre

- CISA KEV: No listing in collected sources

- EPSS: 0.54% as of 2026-11-10; percentile 45.82%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-688

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://launchpad.net/bugs/2161276 (CNA: mitre; issue-tracking)

- https://launchpad.net/bugs/2161771 (CNA: mitre; issue-tracking)

- https://security.openstack.org/ossa/OSSA-2026-036.html (CNA: mitre; vendor-advisory)

- https://lists.openstack.org/archives/list/openstack-announce@lists.openstack.org/thread/O6PKAUNMNZP6FRHLUUGBYELCRBEPB52B/ (CNA: mitre; vendor-advisory, mailing-list)

- https://www.openwall.com/lists/oss-security/2026/08/19/5 (CNA: mitre)

- http://www.openwall.com/lists/oss-security/2026/08/20/21 (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2026/11/msg00019.html (ADP: CVE)

- https://lists.debian.org/debian-lts-announce/2026/11/msg00020.html (ADP: CVE)

## Provenance

- CNA: mitre: https://www.cve.org/CVERecord?id=CVE-2026-76878; retrieved 2026-11-12; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-76878; retrieved 2026-11-12; source updated Not reported

Revision: 86b0f75d053198e78a1ab531dd4bdd5e6309358b4663c7698d8206fc599c8970

Canonical: https://y2.dev/cve/CVE-2026-76878

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