Authenticated Kubernetes resource access via missing return
Published May 28, 2026 · Updated May 28, 2026
Incorrect authorization in Portainer Community Edition 2.33.0 through 2.33.7 allows remote authenticated users to access Kubernetes resources. In kubeClientMiddleware, an error from security.RetrieveTokenData writes HTTP 403 but does not return, so the request proceeds with nil token data. A valid Portainer session and access to the Kubernetes middleware are required; the bypass permits reads and writes allowed to Portainer's cluster service account.
Summary
What happened
Incorrect authorization in Portainer Community Edition 2.33.0 through 2.33.7 allows remote authenticated users to access Kubernetes resources. In kubeClientMiddleware, an error from security.RetrieveTokenData writes HTTP 403 but does not return, so the request proceeds with nil token data. A valid Portainer session and access to the Kubernetes middleware are required; the bypass permits reads and writes allowed to Portainer's cluster service account.
The record
- CVE
- CVE-2026-44882
- Published
- May 28, 2026
- Updated
- May 28, 2026
- Vendor
- Portainer
- Product
- Portainer Community Edition
- Classifications
- CWE-863, T1068
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 28, 2026CVE publishedPublication date reported by the CVE source.
- May 28, 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.
- Affected versionversion=>= 2.33.0, < 2.33.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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