CVE-2026-44883 (GCVE-0-2026-44883)

Vulnerability from cvelistv5 – Published: 2026-05-28 20:59 – Updated: 2026-06-02 13:47
VLAI
Title
Portainer: JWT accepted in URL query leaks tokens to logs and referers
Summary
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.
Severity
7.7 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-02 13:46 UTC
CWE
  • CWE-598 - Use of GET Request Method With Sensitive Query Strings
Assigner
GitHub_M CNA
References
Impacted products
Vendor Product Version
portainer portainer Affected: >= 2.33.0, < 2.33.8
Affected: >= 2.39.0, < 2.39.2
Affected: >= 2.40.0, < 2.41.0
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