CVE-2026-44882

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Source
https://cve.org/CVERecord?id=CVE-2026-44882
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44882.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-44882
Aliases
Downstream
Related
Published
2026-05-28T21:01:31.113Z
Modified
2026-08-12T03:51:46.072522179Z
Severity
  • 8.1 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
Summary
Portainer: Kubernetes middleware continues after token validation failure, bypassing endpoint authorization
Details

Portainer Community Edition is a lightweight service delivery platform for containerized applications that can be used to manage Docker, Swarm, Kubernetes and ACI environments. From 2.33.0 to before 2.33., Portainer proxies requests to Kubernetes clusters through a middleware layer (kubeClientMiddleware) that validates the requesting user's token before forwarding traffic to the cluster. When security.RetrieveTokenData returned an error, the middleware wrote an HTTP 403 response but was missing a return statement — execution continued into the handler with a nil tokenData value. The Kubernetes endpoints sit behind Portainer's outer AuthenticatedAccess bouncer, so an attacker requires a valid Portainer session. However, a user whose secondary token validation fails in kubeClientMiddleware — for example a user without permission to access a given Kubernetes endpoint — would have their request forwarded to the cluster anyway, bypassing the authorization check. The same defect was present in both the CE and EE codebases. This vulnerability is fixed in 2.33.8.

Database specific 
{
    "cwe_ids": [
        "CWE-863"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44882.json"
}
References

Affected packages

Git / github.com/portainer/portainer

Affected ranges

Type
GIT
Repo
https://github.com/portainer/portainer
Events
Introduced
0d8802c6d1365588c75793ba891a92268db852d1
Fixed
245f90550729f0269bc7e362f9d282e34788fb7c
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*",
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ],
    "extracted_events": [
        {
            "introduced": "2.33.0"
        },
        {
            "fixed": "2.33.8"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44882.json"