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Vulnerability · Published Aug 19, 2026 · Assigned by mitre

CVE-2026-76878

High 8.4

In plain English

A high-severity security flaw in Aodh from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)8.4High
Exploit odds (30 days)0.5%top 54.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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).

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12aodhno fix listedDEBIAN-CVE-2026-76878
Debian:13aodhno fix listedDEBIAN-CVE-2026-76878
Debian:14aodh22.0.0-3DEBIAN-CVE-2026-76878
Debian:12watcherno fix listedDEBIAN-CVE-2026-76878
Debian:13watcherno fix listedDEBIAN-CVE-2026-76878
Debian:14watcher16.0.0-5DEBIAN-CVE-2026-76878
Ubuntu:22.04:LTSaodh1:14.1.0-0ubuntu1.1USN-8870-1
Ubuntu:22.04:LTSaodh1:14.1.0-0ubuntu1.1UBUNTU-CVE-2026-76878
Ubuntu:24.04:LTSaodh1:18.0.0-0ubuntu1.1USN-8870-1
Ubuntu:24.04:LTSaodh1:18.0.0-0ubuntu1.1UBUNTU-CVE-2026-76878
Ubuntu:26.04:LTSaodh1:22.0.0-0ubuntu1.1USN-8870-1
Ubuntu:26.04:LTSaodh1:22.0.0-0ubuntu1.1UBUNTU-CVE-2026-76878

Affected products (as reported)

VendorProductVersions
OpenStack Aodh 10.0.0 – before 20.0.121.0.0 – before 21.0.122.0.0 – before 22.0.1

Weakness: CWE-688 · Vector: 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

References