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CVE-2026-44883

Estado: ModificadaAlta (7.7)—

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 2.33.8, 2.39.2, and 2.41.0, Portainer's authentication middleware accepts JWT bearer tokens passed as the ?token=<JWT> URL query parameter on any authenticated API endpoint, in addition to the standard Authorization: Bearer header.

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URLs are recorded in reverse-proxy access logs, browser history, and HTTP Referer headers on outbound navigation, so any JWT passed this way can be harvested by anyone with access to those logs or by an external site the user subsequently visits. A leaked token grants the full privileges of the user it was issued to, until the token expires (default 8 hours, configurable). The ?token= parameter was used by Portainer's browser-based container attach, exec, and pod shell features, so any user with exec or attach rights on a container was exposed — not only administrators. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Requiere interacción del usuario (UI:P) para hacer clic en URL con token JWT; impacto: acceso a cuenta con privilegios del usuario y exposición de credenciales en logs/referer.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

User TrainingPassword PoliciesUser Account ManagementRestrict File and Directory PermissionsPrivileged Account ManagementMulti-factor Authentication

Tecnologías afectadas (1)

Portainer — Portainer

CWE

Referencias

JSON original (NVD)

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      "value": "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 2.33.8, 2.39.2, and 2.41.0, Portainer's authentication middleware accepts JWT bearer tokens passed as the ?token=<JWT> URL query parameter on any authenticated API endpoint, in addition to the standard Authorization: Bearer header. URLs are recorded in reverse-proxy access logs, browser history, and HTTP Referer headers on outbound navigation, so any JWT passed this way can be harvested by anyone with access to those logs or by an external site the user subsequently visits. A leaked token grants the full privileges of the user it was issued to, until the token expires (default 8 hours, configurable). The ?token= parameter was used by Portainer's browser-based container attach, exec, and pod shell features, so any user with exec or attach rights on a container was exposed — not only administrators. This vulnerability is fixed in 2.33.8, 2.39.2, and 2.41.0."
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      "value": "Portainer Community Edition es una plataforma ligera de entrega de servicios para aplicaciones en contenedores que puede usarse para gestionar entornos Docker, Swarm, Kubernetes y ACI. Desde 2.33.0 hasta antes de 2.33.8, 2.39.2 y 2.41.0, el middleware de autenticación de Portainer acepta tokens portadores JWT pasados como el parámetro de consulta URL ?token=<JWT> en cualquier punto final de API autenticado, además del encabezado estándar Authorization: Bearer. Las URL se registran en los registros de acceso del proxy inverso, el historial del navegador y los encabezados HTTP Referer en la navegación saliente, por lo que cualquier JWT pasado de esta manera puede ser recolectado por cualquiera con acceso a esos registros o por un sitio externo que el usuario visite posteriormente. Un token filtrado otorga los privilegios completos del usuario al que fue emitido, hasta que el token expire (8 horas por defecto, configurable). El parámetro ?token= fue utilizado por las funciones de Portainer de adjuntar, ejecutar y shell de pod basadas en navegador para contenedores, por lo que cualquier usuario con derechos de ejecución o adjuntar en un contenedor estuvo expuesto — no solo los administradores. Esta vulnerabilidad está corregida en 2.33.8, 2.39.2 y 2.41.0."
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  "lastModified": "2026-07-21T10:10:00.103",
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