Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L L N U H H N 8.1 .0034 26.5 —
AFFECTED Product Versions Fixed portainer >= 2.33.0, < 2.33.8 – —
TIMELINE May 7 Reserved by GitHub_M May 28 EXPLOIT PUBLISHED — CVE-2026-44882 (portainer). Public exploit reference added. May 28 Published (CNA: GitHub_M)
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.
| Date | Event | Detail |
|---|---|---|
| May 7, 2026 | Reserved | Reserved by GitHub_M |
| May 28, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-44882 (portainer). Public exploit reference added. |
| May 28, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| portainer | portainer | — | >= 2.33.0, < 2.33.8 | — |
Authoritative record: CVE-2026-44882 at cve.org
Vendors: portainer
Weaknesses: CWE-863
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-44882 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.