CVE-2026-30963 Vulnerability Analysis & Exploit Details

CVE-2026-30963
Vulnerability Scoring

3.9
/10
Moderate Risk

Exploiting CVE-2026-30963 requires specific conditions, leading to a moderate security impact.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: High
    High-level privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: Required
    User interaction is necessary for successful exploitation.

CVE-2026-30963 Details

Status: Analyzed

Last updated: 🕗 03 Jun 2026, 20:22 UTC
Originally published on: 🕖 01 Jun 2026, 19:16 UTC

Time between publication and last update: 2 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L

CVE-2026-30963 Vulnerability Summary

CVE-2026-30963: Capsule is a multi-tenancy and policy-based framework for Kubernetes. To defend against namespace hijacking achieved through update/patch operations on namespaces, Capsule uses a webhook to validate update requests targeting namespaces. However, in Kubernetes, the namespace/finalize and namespace/status subresource APIs can also modify various fields of a namespace, including the metadata field. Prior to version 0.13.0, the webhook does not define interception rules for these subresources. As a result, if a tenant administrator has permission to modify namespace/status or namespace/finalize, they can successfully perform namespace hijacking. Version 0.13.0 fixes the issue. Another mitigation is to add two subresources (namespaces and snamespaces/status with namespace/finalize within it) to the resources list in the ValidatingWebhookConfiguration rules.

Assessing the Risk of CVE-2026-30963

Access Complexity Graph

The exploitability of CVE-2026-30963 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-30963

The exploitability of CVE-2026-30963 is influenced by multiple factors. Security teams should analyze system configurations and apply appropriate countermeasures to mitigate threats.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-30963, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-30963, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-30963 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: Low
    Exploiting CVE-2026-30963 may cause minor changes to data without severely impacting its accuracy.
  • Availability: Low
    CVE-2026-30963 may slightly degrade system performance without fully affecting service availability.

CVE-2026-30963 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:a:projectcapsule:capsule:-:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:-:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.4:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.4:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.5:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.5:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.5:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.5:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.0.5:rc2:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.0.5:rc2:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc4:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc4:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc5:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc5:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.0:rc6:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.0:rc6:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.1:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.1:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.1:rc0:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.1:rc0:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.1:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.1:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.2:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.2:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.2:rc0:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.2:rc0:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.2:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.2:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.2.0:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.2.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.2.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.3.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.3.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.3.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.3.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.0:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.0:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.0:rc2:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.0:rc2:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.0:rc3:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.0:rc3:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.6.0:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.6.0:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.6.0:rc0:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.6.0:rc0:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.0:-:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.0:-:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.7.4:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.7.4:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.4:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.4:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.5:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.5:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.6:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.6:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.7:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.7:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.8:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.8:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.10.9:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.10.9:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.11.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.11.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.12.3:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.12.3:*:*:*:*:*:*:*
  • cpe:2.3:a:projectcapsule:capsule:0.12.4:*:*:*:*:*:*:*
    cpe:2.3:a:projectcapsule:capsule:0.12.4:*:*:*:*:*:*:*

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