CVE-2026-39842Public exploitNetwork attack vector

Authenticated code execution via unsandboxed JavaScript rules

Published Apr 14, 2026 · Updated Apr 14, 2026

Expression injection in OpenRemote before 1.22.0 allows remote authenticated users to execute arbitrary code through JavaScript rules. RulesetDeployment.compileRulesJavascript appends supplied rules text and passes it to Nashorn ScriptEngine.eval without a ClassFilter, while RulesResourceImpl omits the superuser restriction for JavaScript. Remote authenticated users need only the write:rules role; the resulting JVM access permits file and environment-variable reads and cross-tenant access.

CVSS severity9.9
Critical
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Expression injection in OpenRemote before 1.22.0 allows remote authenticated users to execute arbitrary code through JavaScript rules. RulesetDeployment.compileRulesJavascript appends supplied rules text and passes it to Nashorn ScriptEngine.eval without a ClassFilter, while RulesResourceImpl omits the superuser restriction for JavaScript. Remote authenticated users need only the write:rules role; the resulting JVM access permits file and environment-variable reads and cross-tenant access.

The record

CVE
CVE-2026-39842
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
OpenRemote
Product
OpenRemote
Classifications
CWE-917, CWE-94, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=< 1.22.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenRemote · OpenRemoteversion=< 1.22.0

Published CVSS scores

9.9GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A: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 exploitPublished

Weakness, pattern, technique

CWE-917Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
CWE-94Improper Control of Generation of Code ('Code Injection')
T1059.007JavaScript/JScript

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo