Vulnerability · Published May 28, 2026 · Assigned by GitHub_M

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

Medium 6.0

In plain English

A medium-severity missing authorization in portainer from portainer. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.0Medium

Exploit odds (30 days)0.3%top 82.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	github.com/portainer/portainer	2.33.8	GHSA-cqpq-2fgr-8mvc
Go	github.com/portainer/portainer	2.39.1	GHSA-cqpq-2fgr-8mvc
Go	github.com/portainer/portainer	no fix listed	GO-2026-5333

Affected products (as reported)

Vendor	Product	Versions
portainer	portainer	>= 2.33.0, < 2.33.8>= 2.39.0, < 2.39.1

Weakness: CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

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