Heymrun Heym up to 0.0.111 build_public_base_url information disclosure

Summaryinfo

A vulnerability was found in Heymrun Heym up to 0.0.111. It has been rated as problematic. The affected element is the function build_public_base_url. Performing a manipulation results in information disclosure. This vulnerability is known as CVE-2026-105396. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Heymrun Heym up to 0.0.111. This affects the function build_public_base_url. The manipulation with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

Heym before v0.0.112 contains a token leakage vulnerability in build_public_base_url() that allows unauthenticated attackers to redirect HITL review links by spoofing Origin or X-Forwarded-Host headers. Attackers can trigger anonymous workflows with forged headers so reviewer notifications point to attacker domains, capturing capability tokens to submit decisions executed with owner credentials.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-105396 since 10/05/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 0.0.112 eliminates this vulnerability.

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Productinfo

Vendor

• Heymrun

Name

• Heym

Version

• 0.0.111

Website

• Product: https://github.com/heymrun/heym/

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