vas3k TaxHacker up to 0.8.5 Server Actions actions.ts userId authorization

Summaryinfo

A vulnerability labeled as critical has been found in vas3k TaxHacker up to 0.8.5. Affected by this issue is some unknown functionality of the file app/(app)/settings/actions.ts of the component Server Actions. Executing a manipulation of the argument userId can lead to authorization. This vulnerability is handled as CVE-2026-125749. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in vas3k TaxHacker up to 0.8.5 and classified as critical. This vulnerability affects an unknown part of the file app/(app)/settings/actions.ts of the component Server Actions. The manipulation of the argument userId with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

TaxHacker through 0.8.5 contains an insecure direct object reference vulnerability in app/(app)/settings/actions.ts that allows authenticated users to modify other users' data by supplying an arbitrary userId. Attackers can invoke Server Actions like deleteCategoryAction or editFieldAction with a victim's UUID to delete categories, clear transaction assignments, or alter LLM prompts.

The advisory is available at github.com. This vulnerability was named CVE-2026-125749 since 11/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• vas3k

Name

• TaxHacker

Version

• 0.8.0
• 0.8.1
• 0.8.2
• 0.8.3
• 0.8.4
• 0.8.5

Website

• Product: https://github.com/vas3k/TaxHacker/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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