CVE-2026-66795

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-08-17. a secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.1Exploit: None knownExposed: 0

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

A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a spoke cluster to submit a malicious CSR. Successful exploitation can lead to privilege escalation, enabling the attacker to obtain administrative credentials on the hub cluster.

CVSS v3
9.1
EG Score
9.1(high)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity91% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
12%
KEV
Not listed

Published

August 17, 2026

Last Modified

August 18, 2026

Advisory Details (2)

Auto-updated Aug 17, 2026
Patch available. Sources: redhat.
redhat

2507540 – (CVE-2026-66795) CVE-2026-66795 managedcluster-import-controller: managedcluster-import-controller: CSR auto-approver does not validate certificate Subject, signerName, or requester identity

https://bugzilla.redhat.com/show_bug.cgi?id=2507540
redhat Patch Available

CVE-2026-66795 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-66795

Vendor Advisories for CVE-2026-66795(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 33× in last 7d / 33× 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. 2026-08-21 07:04 UTCGHSA enrichment
  2. 2026-08-21 03:11 UTCGHSA enrichment
  3. 2026-08-20 23:18 UTCEG score recompute
  4. 2026-08-20 23:18 UTCGHSA enrichment
  5. 2026-08-20 22:56 UTCEPSS rescore
  6. 2026-08-20 19:26 UTCGHSA enrichment
  7. 2026-08-20 15:34 UTCGHSA enrichment
  8. 2026-08-20 11:39 UTCGHSA enrichment
  9. 2026-08-20 07:47 UTCGHSA enrichment
  10. 2026-08-20 03:55 UTCGHSA enrichment
  11. 2026-08-20 00:03 UTCGHSA enrichment
  12. 2026-08-19 20:08 UTCEG score recompute
  13. 2026-08-19 20:08 UTCGHSA enrichment
  14. 2026-08-19 17:04 UTCEPSS rescore
  15. 2026-08-19 16:14 UTCGHSA enrichment
  16. 2026-08-19 12:14 UTCGHSA enrichment
  17. 2026-08-19 08:21 UTCGHSA enrichment
  18. 2026-08-19 04:28 UTCGHSA enrichment
  19. 2026-08-19 00:34 UTCGHSA enrichment
  20. 2026-08-18 20:38 UTCGHSA enrichment
  21. 2026-08-18 16:45 UTCEG score recompute
  22. 2026-08-18 16:45 UTCGHSA enrichment
  23. 2026-08-18 15:24 UTCEG score recompute
  24. 2026-08-18 15:24 UTCGHSA enrichment
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 8 more
  1. 2026-08-18 13:03 UTCGHSA enrichment
  2. 2026-08-18 09:11 UTCGHSA enrichment
  3. 2026-08-18 05:16 UTCGHSA enrichment
  4. 2026-08-18 01:22 UTCEG score recompute
  5. 2026-08-18 01:22 UTCGHSA enrichment
  6. 2026-08-17 21:30 UTCEG score recompute
  7. 2026-08-17 20:55 UTCEG score recompute
  8. 2026-08-17 20:54 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-66795?
CVE-2026-66795 is a critical vulnerability published on August 17, 2026. A flaw was found in the managedcluster-import-controller. The Certificate Signing Request (CSR) auto-approval logic improperly validates incoming CSRs, specifically by not inspecting the signer name or decoding the PEM-encoded x509 CSR. This vulnerability allows a privileged service account on a…
When was CVE-2026-66795 disclosed?
CVE-2026-66795 was first published in the National Vulnerability Database on August 17, 2026, with the most recent update on August 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66795 actively exploited?
CVE-2026-66795 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 87.7% of all scored CVEs.
What is the CVSS score of CVE-2026-66795?
CVE-2026-66795 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2026-66795?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66795, 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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