CVE-2026-42796

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-04. the CNA's CVSS baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Arelle before 2.39.10 contains an unauthenticated remote code execution vulnerability in the /rest/configure REST endpoint that accepts a plugins query parameter and forwards it to the plugin manager without authentication or authorization. Attackers can supply a URL to a malicious Python file through the plugins parameter, causing the Arelle webserver to download and execute the attacker-controlled code within the Arelle process with its privileges.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Track)
EG Risk 75/100SSVC: Track

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
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
85%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Sep 12, 2026
Patch available. Sources: github_release, github_pr.
generic

Arelle < 2.39.10 Unauthenticated RCE via /rest/configure | Advisories | VulnCheck

https://www.vulncheck.com/advisories/arelle-unauthenticated-rce-via-rest-configure
github_pr

Restrict Webserver Plugins

Fix merged in Arelle/Arelle PR #2320 on 2026-04-23 — awaiting tagged release

https://github.com/Arelle/Arelle/pull/2320
github_release Patch Available

2.39.10

Patch available: Arelle/Arelle 2.39.10

https://github.com/Arelle/Arelle/releases/tag/2.39.10

Weakness Classification(1)

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

Data Freshness Timeline

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

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 273 total refreshes for this CVE.

  1. 2026-09-13 16:47 UTCEPSS rescore
  2. 2026-09-12 15:01 UTCEPSS rescore
  3. 2026-09-11 17:40 UTCOSV refresh
  4. 2026-09-11 14:53 UTCEPSS rescore
  5. 2026-09-11 09:37 UTCEPSS rescore
  6. 2026-09-10 09:34 UTCEPSS rescore
  7. 2026-09-08 22:00 UTCEPSS rescore
  8. 2026-09-07 16:01 UTCEPSS rescore
  9. 2026-09-06 13:47 UTCEPSS rescore
  10. 2026-09-04 05:06 UTCEPSS rescore
  11. 2026-09-02 14:12 UTCEPSS rescore
  12. 2026-09-01 13:54 UTCEPSS rescore
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:22 UTCEPSS rescore
  15. 2026-08-28 21:41 UTCEPSS rescore
  16. 2026-08-27 14:25 UTCEPSS rescore
  17. 2026-08-26 14:46 UTCEPSS rescore
  18. 2026-08-25 13:49 UTCEPSS rescore
  19. 2026-08-23 21:17 UTCEG score recompute
  20. 2026-08-23 21:17 UTCGHSA enrichment
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-21 23:49 UTCEPSS rescore
  23. 2026-08-20 22:55 UTCEPSS rescore
  24. 2026-08-19 17:03 UTCEPSS rescore
  25. 2026-08-18 13:48 UTCEPSS rescore
Show 75 more
  1. 2026-08-17 13:47 UTCEPSS rescore
  2. 2026-08-17 13:07 UTCEG score recompute
  3. 2026-08-17 13:07 UTCGHSA enrichment
  4. 2026-08-16 14:56 UTCEPSS rescore
  5. 2026-08-16 09:14 UTCGHSA enrichment
  6. 2026-08-16 05:02 UTCEG score recompute
  7. 2026-08-16 05:02 UTCGHSA enrichment
  8. 2026-08-16 02:14 UTCEPSS rescore
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-15 00:11 UTCGHSA enrichment
  11. 2026-08-14 20:04 UTCGHSA enrichment
  12. 2026-08-14 15:58 UTCGHSA enrichment
  13. 2026-08-14 11:51 UTCGHSA enrichment
  14. 2026-08-14 07:44 UTCGHSA enrichment
  15. 2026-08-14 03:37 UTCEG score recompute
  16. 2026-08-14 03:37 UTCGHSA enrichment
  17. 2026-08-13 22:00 UTCEPSS rescore
  18. 2026-08-13 10:51 UTCGHSA enrichment
  19. 2026-08-13 06:36 UTCGHSA enrichment
  20. 2026-08-13 01:30 UTCGHSA enrichment
  21. 2026-08-12 21:24 UTCGHSA enrichment
  22. 2026-08-12 17:15 UTCEG score recompute
  23. 2026-08-12 17:14 UTCGHSA enrichment
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-12 00:31 UTCGHSA enrichment
  26. 2026-08-11 20:14 UTCGHSA enrichment
  27. 2026-08-11 16:08 UTCEG score recompute
  28. 2026-08-11 16:08 UTCGHSA enrichment
  29. 2026-08-11 13:43 UTCEPSS rescore
  30. 2026-08-11 05:45 UTCGHSA enrichment
  31. 2026-08-11 01:39 UTCEG score recompute
  32. 2026-08-11 01:39 UTCGHSA enrichment
  33. 2026-08-11 00:00 UTCEPSS rescore
  34. 2026-08-10 11:49 UTCGHSA enrichment
  35. 2026-08-10 07:42 UTCGHSA enrichment
  36. 2026-08-10 03:35 UTCGHSA enrichment
  37. 2026-08-09 23:27 UTCGHSA enrichment
  38. 2026-08-09 19:20 UTCGHSA enrichment
  39. 2026-08-09 15:13 UTCEG score recompute
  40. 2026-08-09 15:13 UTCGHSA enrichment
  41. 2026-08-09 13:46 UTCEPSS rescore
  42. 2026-08-09 11:07 UTCGHSA enrichment
  43. 2026-08-09 06:51 UTCGHSA enrichment
  44. 2026-08-09 02:44 UTCEG score recompute
  45. 2026-08-09 02:44 UTCGHSA enrichment
  46. 2026-08-08 16:37 UTCEPSS rescore
  47. 2026-08-08 12:07 UTCGHSA enrichment
  48. 2026-08-08 07:57 UTCGHSA enrichment
  49. 2026-08-08 03:50 UTCGHSA enrichment
  50. 2026-08-07 23:43 UTCGHSA enrichment
  51. 2026-08-07 19:36 UTCEG score recompute
  52. 2026-08-07 19:36 UTCGHSA enrichment
  53. 2026-08-07 15:29 UTCGHSA enrichment
  54. 2026-08-07 11:22 UTCGHSA enrichment
  55. 2026-08-07 02:13 UTCGHSA enrichment
  56. 2026-08-06 21:07 UTCGHSA enrichment
  57. 2026-08-06 17:00 UTCEG score recompute
  58. 2026-08-06 17:00 UTCGHSA enrichment
  59. 2026-08-06 13:46 UTCEPSS rescore
  60. 2026-08-06 11:03 UTCGHSA enrichment
  61. 2026-08-06 06:42 UTCGHSA enrichment
  62. 2026-08-06 02:35 UTCGHSA enrichment
  63. 2026-08-05 22:28 UTCEG score recompute
  64. 2026-08-05 22:28 UTCGHSA enrichment
  65. 2026-08-05 19:17 UTCEPSS rescore
  66. 2026-08-04 15:10 UTCEPSS rescore
  67. 2026-08-04 10:38 UTCEPSS rescore
  68. 2026-08-04 04:24 UTCGHSA enrichment
  69. 2026-08-04 00:09 UTCGHSA enrichment
  70. 2026-08-03 20:01 UTCEG score recompute
  71. 2026-08-03 20:01 UTCGHSA enrichment
  72. 2026-08-03 10:36 UTCEPSS rescore
  73. 2026-08-03 02:19 UTCGHSA enrichment
  74. 2026-08-02 22:13 UTCGHSA enrichment
  75. 2026-08-02 18:06 UTCGHSA enrichment

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-42796.yaml
    First seen Jan 1, 2026

    Arelle < 2.39.10 - Remote Code Execution

    Open source ↗

Frequently asked(5)

What is CVE-2026-42796?
CVE-2026-42796 is a critical vulnerability published on May 4, 2026. Arelle before 2.39.10 contains an unauthenticated remote code execution vulnerability in the /rest/configure REST endpoint that accepts a plugins query parameter and forwards it to the plugin manager without authentication or authorization. Attackers can supply a URL to a malicious Python file…
When was CVE-2026-42796 disclosed?
CVE-2026-42796 was first published in the National Vulnerability Database on May 4, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42796 actively exploited?
CVE-2026-42796 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 14.6% of all scored CVEs.
What is the CVSS score of CVE-2026-42796?
CVE-2026-42796 has a CVSS v4.0 base score of 9.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-42796?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42796, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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