CVE-2026-44883
Portainer: JWT accepted in URL query leaks tokens to logs and referers
Description
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.
INFO
Published Date :
May 28, 2026, 10:16 p.m.
Last Modified :
July 21, 2026, 10:10 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update Portainer CE to version 2.33.8 or later.
- Update Portainer CE to version 2.39.2 or later.
- Update Portainer CE to version 2.41.0 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-44883.
| URL | Resource |
|---|---|
| https://github.com/portainer/portainer/security/advisories/GHSA-jvp4-q659-95mj | Exploit Third Party Advisory |
| https://github.com/portainer/portainer/security/advisories/GHSA-jvp4-q659-95mj | Exploit Third Party Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-44883 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-44883
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-44883 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-44883 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added Translation Title: Portainer Community Edition, Description: 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. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'portainer', 'product': 'portainer', 'versions': [{'status': 'affected', 'version': '>= 2.33.0, < 2.33.8'}, {'status': 'affected', 'version': '>= 2.39.0, < 2.39.2'}, {'status': 'affected', 'version': '>= 2.40.0, < 2.41.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-44883', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-06-02T13:46:34.014167Z'} -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 02, 2026
Action Type Old Value New Value Added Reference https://github.com/portainer/portainer/security/advisories/GHSA-jvp4-q659-95mj -
Initial Analysis by [email protected]
Jun. 01, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:* versions from (including) 2.33.0 up to (excluding) 2.33.8 *cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:* versions from (including) 2.34.0 up to (excluding) 2.39.2 *cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:* versions from (including) 2.40.0 up to (excluding) 2.41.0 Added Reference Type GitHub, Inc.: https://github.com/portainer/portainer/security/advisories/GHSA-jvp4-q659-95mj Types: Exploit, Third Party Advisory -
New CVE Received by [email protected]
May. 28, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-598 Added Reference https://github.com/portainer/portainer/security/advisories/GHSA-jvp4-q659-95mj