CVE-2026-39842

CRITICALNVD 9.99.9
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.9% (59th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Trending — 3 sources updated this weekElevated
9.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.9%CVSS: 9.9Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

OpenRemote is an open-source IoT platform. Versions 1.21.0 and below contain two interrelated expression injection vulnerabilities in the rules engine that allow arbitrary code execution on the server. The JavaScript rules engine executes user-supplied scripts via Nashorn's ScriptEngine.eval() without sandboxing, class filtering, or access restrictions, and the authorization check in RulesResourceImpl only restricts Groovy rules to superusers while leaving JavaScript rules unrestricted for any user with the write:rules role. Additionally, the Groovy rules engine has a GroovyDenyAllFilter security filter that is defined but never registered, as the registration code is commented out, rendering the SandboxTransformer ineffective for superuser-created Groovy rules. A non-superuser attacker with the write:rules role can create JavaScript rulesets that execute with full JVM access, enabling remote code execution as root, arbitrary file read, environment variable theft including database credentials, and complete multi-tenant isolation bypass to access data across all realms. This issue has been fixed in version 1.22.0.

CVSS v3
9.9
EG Score
9.9CRITICALmedium confidence
EG Risk
61
EG Risk 61/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity99% × 45%
The EG Score, 9.9 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.9%
EPSS %ILE
59th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 15, 2026

Last Modified

April 23, 2026

Advisory Details (2)

Auto-updated Oct 12, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_release.
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Expression Injection in OpenRemote · Advisory · openremote/openremote · GitHub

https://github.com/openremote/openremote/security/advisories/GHSA-7mqr-33rv-p3mp
GitHub release Patch Available

1.22.0

Patch available: openremote/openremote 1.22.0

https://github.com/openremote/openremote/releases/tag/1.22.0

Affected Packages

(1 across 1 ecosystem)
Maven(1)
PackageVulnerable rangeFix by version rangeDependents
io.openremote:openremote-manager1.10.0 ... 1.9.0 (47 versions)
  • every version up to 1.22.0: fixed in 1.22.0
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 33× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 186 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 18:53 UTCEG score recompute
  2. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  3. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  4. 2026-10-15 16:03 UTCEG score recompute
  5. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.9% · 59th percentile
  6. 2026-10-14 10:12 UTCEG score recompute
  7. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  8. 2026-10-13 08:33 UTCEG score recompute
  9. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  10. 2026-10-12 16:10 UTCEG score recompute
  11. 2026-10-11 19:52 UTCEG score recompute
  12. 2026-10-11 17:05 UTCEG score recompute
  13. 2026-10-11 14:32 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  15. 2026-10-11 06:55 UTCOSV refresh
  16. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  17. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  18. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  20. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  21. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  22. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  23. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  24. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  25. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.9% · 58th percentile
Show 71 more
  1. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  2. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  3. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  4. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  5. 2026-09-21 19:19 UTCOSV refresh
  6. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  7. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  8. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  9. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  11. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  12. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  13. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  15. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  16. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  17. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  18. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  19. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  20. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  21. 2026-09-02 16:08 UTCOSV refresh
  22. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.9% · 58th percentile
  23. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  24. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  25. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  26. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  27. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  28. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  29. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  30. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  31. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  32. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  33. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  34. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  35. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  36. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  37. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  38. 2026-08-16 06:42 UTCEG score recompute
  39. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  40. 2026-08-15 02:30 UTCEG score recompute
  41. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  42. 2026-08-14 04:46 UTCEG score recompute
  43. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  44. 2026-08-12 18:58 UTCEG score recompute
  45. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  46. 2026-08-11 18:52 UTCEG score recompute
  47. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  48. 2026-08-11 02:41 UTCEG score recompute
  49. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  50. 2026-08-09 16:44 UTCEG score recompute
  51. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  52. 2026-08-09 04:05 UTCEG score recompute
  53. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  54. 2026-08-07 17:33 UTCEG score recompute
  55. 2026-08-06 17:29 UTCEG score recompute
  56. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.9% · 57th percentile
  57. 2026-08-05 23:26 UTCEG score recompute
  58. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  59. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  60. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  61. 2026-08-03 21:38 UTCEG score recompute
  62. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  63. 2026-08-02 13:19 UTCEG score recompute
  64. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  65. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  66. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  67. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  68. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  69. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  70. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.9% · 56th percentile
  71. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.9% · 56th percentile

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Frequently asked(5)

What is CVE-2026-39842?
CVE-2026-39842 is a critical-severity vulnerability; its CVE record was published on April 15, 2026. OpenRemote is an open-source IoT platform. Versions 1.21.0 and below contain two interrelated expression injection vulnerabilities in the rules engine that allow arbitrary code execution on the server. The JavaScript rules engine executes user-supplied scripts via Nashorn's ScriptEngine.eval()…
When was the CVE record for CVE-2026-39842 published?
The CVE record for CVE-2026-39842 was published on April 15, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 23, 2026; the record at its source may have been updated since.
Is CVE-2026-39842 actively exploited?
CVE-2026-39842 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.9% probability of exploitation in the next 30 days (59th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-39842?
CVE-2026-39842 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-39842?
A fix for CVE-2026-39842 is available: update to the fixed version the vendor names in its advisory.

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