How severe is CVE-2026-44884?

CVE-2026-44884 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-44884 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-44884?

CVE-2026-44884 affects Portainer. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-44884?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-44884 have an EU (EUVD) identifier?

Yes. CVE-2026-44884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33058.

When was CVE-2026-44884 published?

CVE-2026-44884 was published on 2026-05-28 and last updated on 2026-06-17.

CVE-2026-44884

CVE-2026-44884 is a medium-severity vulnerability in Portainer with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.0
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33058
Weakness: CWE-862
Affected product: Portainer
Published: 2026-05-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-44884?: 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.
How severe is CVE-2026-44884?: CVE-2026-44884 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-44884 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-44884?: CVE-2026-44884 affects Portainer. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-44884?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-44884 have an EU (EUVD) identifier?: Yes. CVE-2026-44884 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33058.
When was CVE-2026-44884 published?: CVE-2026-44884 was published on 2026-05-28 and last updated on 2026-06-17.

References

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

Affected products (1)

cpe:2.3:a:portainer:portainer:*:*:*:*:community:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

171.25.158.80 (ipv4-addr)
160.191.87.178 (ipv4-addr)
51.159.103.72 (ipv4-addr)