CVE-2026-44849Network attack vector

Host-root access via unchecked Swarm service requests

Published May 28, 2026 · Updated May 28, 2026

Authorization bypass in affected Portainer Community Edition releases allows remote authenticated users to gain host-root access through Swarm APIs. The service-create parser omits capabilities, sysctls, and confinement fields, while service update performs no EndpointSecuritySettings body inspection before forwarding requests. Exploitation requires a non-admin account with access to a Docker Swarm endpoint and configured restrictions; crafted services can mount the host and run with root-equivalent privileges.

CVSS severity9.4
Critical
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in affected Portainer Community Edition releases allows remote authenticated users to gain host-root access through Swarm APIs. The service-create parser omits capabilities, sysctls, and confinement fields, while service update performs no EndpointSecuritySettings body inspection before forwarding requests. Exploitation requires a non-admin account with access to a Docker Swarm endpoint and configured restrictions; crafted services can mount the host and run with root-equivalent privileges.

The record

CVE
CVE-2026-44849
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Portainer
Product
Portainer Community Edition
Classifications
CWE-862, T1611
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.33.0, < 2.33.8
  2. Affected versionversion=>= 2.39.0, < 2.39.2
  3. Affected versionversion=>= 2.40.0, < 2.41.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Portainer · Portainer Community Editionversion=>= 2.33.0, < 2.33.8; version=>= 2.39.0, < 2.39.2; version=>= 2.40.0, < 2.41.0

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
9.4GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1611Escape to Host

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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