2.7

CVE-2026-66721: apache software foundation apache cloudstack Missing Authorization

CVSS: 2.7v3.1LowAnalyzed
Published 21-08-2026Last modified 24-08-2026
Open JSON

Vulnerability summary

CVE-2026-66721 is a low (CVSS 2.7) Missing Authorization vulnerability in apache software foundation apache cloudstack. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.7% of scored vulnerabilities.

Overall risk
11/100
0100
Low · default modelHow is this calculated?
CVSS score
2.7/10
010
Low · v3.1 (CVE.org)
EPSS score
0.48%
0%100%
Low · +0.20 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 21-08-2026
    PublishedVulnerability first disclosed.
  2. 24-08-2026
    Last modifiedVulnerability information updated.

Description

Missing authorization issue for domain admins in CloudStack's host tags listing functionality. Domain Admins, by default, have permission to call the listHostTags API, but the API returns host tags for every host in the environment without domain scoping. It should instead be restricted to only the hosts dedicated to that admin's domain. This issue affects Apache CloudStack: from 4.12.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1 or later, which fixes the issue.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.48%

Chance of exploitation in the next 30 days

Percentile

40%

Versus all other CVEs

30-day change

+0.20 pp

From 0.27% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.48%

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

Apache1 product
  • cloudstack≥ 4.12.0.0, < 4.20.3.1 | ≥ 4.21.0.0, < 4.22.1.1
Apache software foundation1 product

2 vendors · 2 products

References

1 links