8.4

CVE-2026-76878: openstack aodh

CVSS: 8.4v4.0HighAwaiting analysis
AliasesUBUNTU-CVE-2026-76878USN-8870-1DEBIAN-CVE-2026-76878
Published 19-08-2026Last modified 21-08-2026
Open JSON

Vulnerability summary

CVE-2026-76878 is a high (CVSS 8.4) vulnerability in openstack aodh. EPSS estimates a 0.54% chance of exploitation in the next 30 days, higher than 44.3% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.4/10
010
High · v4.0 (CVE.org)
EPSS score
0.54%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 19-08-2026
    PublishedVulnerability first disclosed.
  2. 21-08-2026
    Last modifiedVulnerability information updated.

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).

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.54%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

+0.06 pp

From 0.48% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.54%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian2 products
  • aodhAll versions (No fix recorded) | < 22.0.0-3
  • watcherAll versions (No fix recorded) | < 16.0.0-5
Ubuntu2 products
  • aodh< 10.0.0-0ubuntu0.20.04.1+esm1 | < 1:14.1.0-0ubuntu1.1 | < 1:18.0.0-0ubuntu1.1 | < 1:22.0.0-0ubuntu1.1
  • watcher< 1:4.0.0-0ubuntu0.20.04.1+esm1 | < 2:8.0.0-0ubuntu1.2+esm1 | < 2:12.0.0-0ubuntu1.3+esm1 | < 2:16.0.0-0ubuntu1+esm1
Openstack1 product
  • aodh≥ 10.0.0, < 20.0.1 | ≥ 21.0.0, < 21.0.1 | ≥ 22.0.0, < 22.0.1

3 vendors · 5 products

References

10 links