CVE-2026-44884: Portainer Community Edition is a lightweight service delivery platform for containerized applications that can

Routine

MEDIUM 6.5UPGRADE

CVE-2026-44884 is a medium-severity flaw (CVSS 6.5) affecting portainer. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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, by

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 83%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-05-28
Last modified	2026-07-21

Publisher (CNA): GitHub, Inc. · Vendor: portainer

Last updated 2026-07-21 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-28 22:16 UTCPublished CVE record published
2026-07-21 10:10 UTCUpdated Record last modified

portainer portainer UPGRADE

Affected: >= 2.33.0 and < 2.33.8 · >= 2.39.0 and < 2.39.1

Fixed in: 2.33.8, 2.39.1

Safe to downgrade to: a release before 2.33.0

1. Check installed version

apt-cache policy portainer || rpm -q portainer || portainer --version

2. UPGRADE to 2.33.8 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade portainer

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade portainer

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.33.0 (Debian / Ubuntu)

apt-cache madison portainer sudo apt install portainer=<VERSION_BEFORE_2.33.0> sudo apt-mark hold portainer

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list portainer sudo dnf downgrade portainer-<VERSION_BEFORE_2.33.0> sudo dnf versionlock add portainer

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-44884?

portainer: upgrade to 2.33.8, 2.39.1. Exact commands for each OS are on this page.

Is CVE-2026-44884 being exploited?

CVE-2026-44884 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-44884 affect?

CVE-2026-44884 affects portainer. Severity is medium (CVSS 6.5). 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 authorizatio

How urgent is CVE-2026-44884?

Priority 32/100. Public exploit reference

Software pages

Docker vulnerabilities · Kubernetes vulnerabilities

Related CVEs

CVE-2026-44881 CRITICAL 9.9 UPGRADE Portainer Community Edition is a lightweight service delivery platform for containerized applications that can
CVE-2026-44849 HIGH 8.8 UPGRADE Portainer Community Edition is a lightweight service delivery platform for containerized applications that can
CVE-2026-44848 HIGH 8.8 UPGRADE Portainer Community Edition is a lightweight service delivery platform for containerized applications that can
CVE-2026-44882 HIGH 8.1 UPGRADE Portainer Community Edition is a lightweight service delivery platform for containerized applications that can
CVE-2026-44850 HIGH 8.5 UPGRADE Portainer Community Edition is a lightweight service delivery platform for containerized applications that can

References

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