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VulnerabilityPublished

CVE-2026-6383: Red Hat OpenShift Virtualization 4 · Incorrect Authorization

Affects Red Hat OpenShift Virtualization 4Source CVE Database V5

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Not known to be exploited · CVSS 5.4 Medium.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 3.1 base score
5.4Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 15 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hatredhat/openshift-virtualizationpkg:rpm/redhat/openshift-virtualizationOther threatsAffected
  • =4
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until an official fix is released, review and restrict custom RBAC roles to minimize exposure to this issue. Avoid granting overly broad permissions on subresources and monitor for any unusual access patterns related to subresource operations.

Description

CVE-2026-6383 is a medium-severity vulnerability in Red Hat OpenShift Virtualization 4 caused by incorrect authorization in KubeVirt's RBAC evaluation logic. The flaw arises from improper truncation of subresource names during permission checks, which can lead to authenticated users with certain custom roles gaining unauthorized access to subresources. This may result in unauthorized disclosure of sensitive information or unauthorized actions. Conversely, some legitimate users might be incorrectly denied access to resources. No official patch or remediation level has been confirmed yet according to the vendor advisory.

References

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