Chartbrew up to 5.2.0 Outbound URL Guard outboundTargetPolicy.js improper authentication

Summaryinfo

A vulnerability described as problematic has been identified in Chartbrew up to 5.2.0. This issue affects some unknown processing of the file server/modules/outboundTargetPolicy.js of the component Outbound URL Guard. The manipulation results in improper authentication. This vulnerability is known as CVE-2026-54589. It is possible to launch the attack remotely. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Chartbrew up to 5.2.0. It has been classified as problematic. Affected is an unknown code block of the file server/modules/outboundTargetPolicy.js of the component Outbound URL Guard. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on confidentiality. CVE summarizes:

Chartbrew is an open-source web application that can connect directly to databases and APIs and use the data to create charts. Prior to 5.2.1, the outbound URL guard recognized ordinary IPv4, IPv6, and IPv4-mapped IPv6 destinations but did not recognize IPv4 addresses embedded in NAT64 prefixes. The vulnerable surface is aPI Data Connection outbound requests routed through server/modules/outboundTargetPolicy.js. An authenticated user with permission to create or edit an API connection supplies an attacker-controlled hostname or redirect whose DNS answer is a NAT64 address embedding a private or link-local IPv4 destination. The policy treated the NAT64 address as public; a NAT64 gateway then translated it to the embedded private IPv4 address after validation. The bypass requires a NAT64/DNS64 deployment path and connection-management privileges. IPv4-only deployments are not affected by this specific bypass. The attacker can read responses from 169.254.169.254 cloud metadata and arbitrary internal IPv4 hosts and ports reachable through the NAT64 gateway. This issue is fixed in version 5.2.1.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-54589 since 06/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit.

Upgrading to version 5.2.1 eliminates this vulnerability.

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Productinfo

Name

• Chartbrew

Version

• 5.0
• 5.1
• 5.2.0

Website

• Product: https://github.com/chartbrew/chartbrew/

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