CVE-2026-44884 Details
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 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.
A missing authorization vulnerability has been identified in Portainer Community Edition versions 2.33.0 prior to 2.33.8 and 2.39.0 prior to 2.39.1. The vulnerability exists in the Custom Template file endpoint (GET /api/custom_templates/{id}/file), where any authenticated user can read the file content of custom templates by sequentially enumerating integer IDs. This bypasses Resource Control access restrictions, exposing sensitive information such as connection strings, API tokens, or registry credentials that should not be accessible to standard users.
Users can upgrade to Portainer Community Edition 2.33.8 or 2.39.1 to address this vulnerability. For those on the 2.33.x LTS branch, the fix is included in version 2.33.8. Administrators who cannot immediately upgrade should avoid storing sensitive information in custom templates and review existing templates for embedded secrets, rotating any exposed credentials.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/portainer/portainer/security/advisories/GHSA-cqpq-2fgr-8mvc | [email protected] | ExploitThird Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-862 | Missing Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| portainer portainer | >= 2.33.0, < 2.33.8 >= 2.39.0, < 2.39.1 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 21, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 1, 2026 | Initial Analysis | [email protected] |
| May 28, 2026 | New CVE Received | [email protected] |