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: 2%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
59(Track)
EG Risk 59/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
2%
EPSS %ILE
82%
KEV
Not listed

Published

May 4, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated Jul 25, 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 9× in last 7d / 33× 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 164 total refreshes for this CVE.

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

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 ↗

Related CVEs(same CWE)

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 2% probability of exploitation in the next 30 days, which ranks it in the top 17.6% 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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