CVE-2026-42796 (GCVE-0-2026-42796)

Vulnerability from cvelistv5 – Published: 2026-05-04 17:19 – Updated: 2026-07-14 20:01 X_Open Source
VLAI Shadowserver Previdian
Title
Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
Summary
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.
Severity
9.2 (Critical)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-04 20:21 UTC
CWE
  • CWE-306 - Missing Authentication for Critical Function
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7380 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Arelle Arelle Affected: 0 , < 2.39.10 (semver)
    cpe:2.3:a:workiva:arelle:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-04-20 00:00
Credits
Mobasi Security Team
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f7f61a53-19fb-4235-a115-a9f845e71fbf

Vulnerability ID: CVE-2026-42796

Status: Confirmed

Status Updated: 2026-10-22 00:00 UTC

Exploited: Yes

Characteristics
Severity: 92.0
Timestamps
First Seen: 2026-09-18
Asserted: 2026-09-18
Last Seen: 2026-10-22
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Arelle / Arelle | Class: other-software | Severity: Critical (CVSS 9.2) | IoT: no | In CISA KEV: no | Honeypot connections on 2026-10-22: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class other-software
7D Avg 0
Vendor Arelle
30D Avg 0
90D Avg 0
Product Arelle
Cisa Kev no
Connections 1
Observation Date 2026-10-22
Vulnerability Class CVSS
Vulnerability Score 9.2
Vulnerability Severity Critical
References
Created: 2026-10-21 09:12 UTC | Updated: 2026-10-24 01:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f69b603f-7812-422f-8a4b-54b30fbcc146

Vulnerability ID: CVE-2026-42796

Status: Confirmed

Status Updated: 2026-09-18 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-09-18
Asserted: 2026-09-18
Scope
Notes: Arelle < 2.39.10 Unauthenticated RCE via /rest/configure | Affected: Arelle / Arelle | CVSS: 9.2 (CRITICAL) | EPSS: 0.02747 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title Arelle < 2.39.10 Unauthenticated RCE via /rest/configure
Cve Id CVE-2026-42796
Vendor Arelle
Ghsa Id None
Product Arelle
Added Date 2026-09-18T00:00:00.000Z
Cvss Score 9.2
Epss Score 0.02747
Previous Ids
Cvss Severity CRITICAL
Virtual Patch False
Cvss Estimated False
Epss Percentile 0.85518
Used In Malware unknown
Vulnerability Id CVE-2026-42796
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-09-19 11:00 UTC | Updated: 2026-09-19 11:00 UTC
Show details on NVD website
To clipboard 

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Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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    Related by attack behaviour

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