Expression Injection in OpenRemote

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

9.9 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS

• CVE-2026-39842: 0.92% estimated exploitation activity in the next 30 days; percentile 60.47 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The OpenRemote IoT platform's rules engine contains two interrelated critical expression injection vulnerabilities that allow an attacker to execute arbitrary code on the server, ultimately achieving full server compromise. - Unsandboxed Nashorn JavaScript Engine: JavaScript rules are executed via Nashorn's ScriptEngine.eval() with user-supplied script content and no sandboxing, class filtering, or access restrictions. Critically, any non-superuser with the write:rules role can create JavaScript rulesets. - Inactive Groovy Sandbox: The Groovy rules engine has a GroovyDenyAllFilter security filter that is defined but never registered (the registration code is commented out), rendering the SandboxTransformer ineffective. While Groovy rules are restricted to superusers, the absence of sandboxing violates the principle of defense in depth. Details Attacker-Controllable Source-to-Sink Paths There are two non-superuser and two superuser exploitable attack paths from the REST API…

Published by the source

14 Apr 2026, 22:31 UTC

Last modified by the source

24 Apr 2026, 20:43 UTC

Source last checked

26 Oct 2026, 16:45 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-7mqr-33rv-p3mp

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# Patch Next advisory brief: CVE-2026-39842

Advisory: Expression Injection in OpenRemote
IDs: CVE-2026-39842, GHSA-7mqr-33rv-p3mp
Record: https://patchnext.com/advisories/cve-2026-39842 (revision 1, source checked 26 Oct 2026, 16:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.9)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: io.openremote:openremote-manager 1.22.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven io.openremote:openremote-manager: affected <= 1.21.0; fixed in 1.22.0

## Suggested inspection (read-only)
- Maven io.openremote:openremote-manager: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on io.openremote:openremote-manager.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-7mqr-33rv-p3mp (GitHub-reviewed advisory GHSA-7mqr-33rv-p3mp lists affected ranges: Maven io.openremote:openremote-manager >=0 <=1.21.0)

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