CVE-2026-44884 — Portainer: Missing authorization on custom template file endpoint exposes template content

Description (CNA)

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 and 2.39.1, a missing authorization vulnerability in the Custom Template file endpoint (GET /api/custom_templates/{id}/file) allows any authenticated user to read the file content of any custom template by enumerating sequential integer IDs, bypassing Resource Control access restrictions. Template files may contain environment-specific values such as connection strings, API tokens, or registry credentials that administrators would not expect standard users to read. This vulnerability is fixed in 2.33.8 and 2.39.1.

Affected (CNA)

Vendor / product	Versions
portainer / portainer	affected >= 2.33.0, < 2.33.8; affected >= 2.39.0, < 2.39.1

CWE

CWE-862

References

https://github.com/portainer/portainer/security/advisories/GHSA-cqpq-2fgr-8mvc

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.