CVE-2026-50545Public exploitNetwork attack vector

Cluster takeover via unchecked PodSpec propagation

Published Jun 10, 2026 · Updated Jun 10, 2026

Improper access control in Fission before 1.24.0 allows remote authenticated users to escape a node and take over the cluster. Environment.Validate omits dangerous PodSpec fields, the create-only webhook misses patched updates, and MergePodSpec forwards host namespaces, hostPath volumes, privilege settings, and service accounts into generated pods. A tenant with create and update access to environments.fission.io can schedule a privileged pod with the host root mounted, read the cluster CA key, and sign arbitrary kubelet certificates.

CVSS severity9.9
Critical
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Fission before 1.24.0 allows remote authenticated users to escape a node and take over the cluster. Environment.Validate omits dangerous PodSpec fields, the create-only webhook misses patched updates, and MergePodSpec forwards host namespaces, hostPath volumes, privilege settings, and service accounts into generated pods. A tenant with create and update access to environments.fission.io can schedule a privileged pod with the host root mounted, read the cluster CA key, and sign arbitrary kubelet certificates.

The record

CVE
CVE-2026-50545
Published
Jun 10, 2026
Updated
Jun 10, 2026
Vendor
Fission
Product
Fission
Classifications
CWE-693, CWE-284, CWE-269, T1611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.24.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fission · Fissionversion=< 1.24.0

Published CVSS scores

9.9GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
CWE-284Improper Access Control
CWE-269Improper Privilege Management
T1611Escape to Host

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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