CVE-2026-42796 (GCVE-0-2026-42796)
Vulnerability from cvelistv5 – Published: 2026-05-04 17:19 – Updated: 2026-07-14 20:01 X_Open SourceTitle
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
9.8 (Critical)
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
References
3 references
| URL | Tags |
|---|---|
| https://github.com/Arelle/Arelle/releases/tag/2.39.10 | release-notespatch |
| https://github.com/Arelle/Arelle/pull/2320 | issue-tracking |
| https://www.vulncheck.com/advisories/arelle-unaut… | third-party-advisory |
Impacted products
Date Public
2026-04-20 00:00
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f69b603f-7812-422f-8a4b-54b30fbcc146
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
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| 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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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