CVE-2026-61400

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 8.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Apache CloudStack's run and get diagnostics functionality for the system VMs and virtual routers.

An authenticated user holding the permissions required to invoke either getDiagnosticsData or runDiagnostics can achieve arbitrary command execution on the system VM and/or Virtual Router instances, with commands running as root (or as the diagnostics-process user, at minimum). This represents a full compromise of the affected instance and, depending on network segmentation, may provide a foothold for lateral movement within the CloudStack-managed infrastructure, including access to guest network traffic handled by the compromised Virtual Router.

The getDiagnosticsData and runDiagnostics APIs are restricted to only Admin role accounts by default.

This issue affects Apache CloudStack: from 4.20.0.0 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 v3
8.8
EG Score
8.8(high)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation2% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
73%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 27, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
No patch confirmed yet.
generic
https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc

Vendor Advisories for CVE-2026-61400(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 23× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 19:00 UTCGHSA enrichment
  3. 2026-08-29 06:33 UTCEG score recompute
  4. 2026-08-29 06:32 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 18:05 UTCGHSA enrichment
  7. 2026-08-28 03:13 UTCGHSA enrichment
  8. 2026-08-27 14:44 UTCEG score recompute
  9. 2026-08-27 14:44 UTCGHSA enrichment
  10. 2026-08-27 14:25 UTCEPSS rescore
  11. 2026-08-27 07:05 UTCGHSA enrichment
  12. 2026-08-26 18:38 UTCEG score recompute
  13. 2026-08-26 18:37 UTCGHSA enrichment
  14. 2026-08-26 14:46 UTCEPSS rescore
  15. 2026-08-26 06:07 UTCGHSA enrichment
  16. 2026-08-25 17:38 UTCEG score recompute
  17. 2026-08-25 17:38 UTCGHSA enrichment
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-25 05:10 UTCGHSA enrichment
  20. 2026-08-24 16:44 UTCEG score recompute
  21. 2026-08-24 16:44 UTCGHSA enrichment
  22. 2026-08-24 06:09 UTCGHSA enrichment
  23. 2026-08-23 17:41 UTCGHSA enrichment
  24. 2026-08-23 05:14 UTCEG score recompute
  25. 2026-08-23 05:14 UTCGHSA enrichment
Show 13 more
  1. 2026-08-23 00:19 UTCEPSS rescore
  2. 2026-08-22 16:48 UTCGHSA enrichment
  3. 2026-08-22 04:21 UTCGHSA enrichment
  4. 2026-08-22 04:01 UTCEG score recompute
  5. 2026-08-22 04:01 UTCGHSA enrichment
  6. 2026-08-21 23:49 UTCEPSS rescore
  7. 2026-08-21 18:18 UTCGHSA enrichment
  8. 2026-08-21 17:40 UTCEG score recompute▲ 8.80
  9. 2026-08-21 17:40 UTCGHSA enrichment
  10. 2026-08-21 17:39 UTCMITRE cvelistV5CVSS v3 → 8.8 · severity → HIGH
  11. 2026-08-21 09:16 UTCNVD update
  12. 2026-08-21 08:40 UTCEG score recompute
  13. 2026-08-21 08:39 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-61400?
CVE-2026-61400 is a high vulnerability published on August 21, 2026. Improper Neutralization of Special Elements used in a Command ('Command Injection') vulnerability in Apache CloudStack's run and get diagnostics functionality for the system VMs and virtual routers. An authenticated user holding the permissions required to invoke either getDiagnosticsData or…
When was CVE-2026-61400 disclosed?
CVE-2026-61400 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-61400 actively exploited?
CVE-2026-61400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 27.3% of all scored CVEs.
What is the CVSS score of CVE-2026-61400?
CVE-2026-61400 has a CVSS v3.1 base score of 8.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-61400?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61400, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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