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CVE-2026-42796

Workiva Arelle remote code execution

9.8 CRITICALEPSS 3.88%
  1. Published4 May 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Workiva Arelle< 2.39.10

Remediation

Fixed in
Workiva Arelle≥ 2.39.10

References

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Frequently asked

Is CVE-2026-42796 being actively exploited?

CVE-2026-42796 is not in the CISA KEV catalog. Its EPSS exploit probability is 3.88%.

How severe is CVE-2026-42796?

CVE-2026-42796 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 3.88% probability of exploitation.

Which products are affected by CVE-2026-42796?

Affected products include Workiva Arelle.

How do I fix CVE-2026-42796?

Upgrade affected software to a fixed version, for example Workiva Arelle 2.39.10 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42796 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.