Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| vas3k | TaxHacker | ≤ 0.8.5 | — |
References
- https://github.com/vas3k/TaxHacker/issues/204 issue-tracking
- https://github.com/vas3k/TaxHacker/commit/d84a912f3a06b141cc275bb07115a204e7f10128 patch
- https://github.com/vas3k/TaxHacker/blob/v0.8.5/app/(app)/settings/actions.ts#L117-L306 technical-description
- https://hackmd.io/@hieund/taxhacker-settings-crud-actions-cross-user-authz third-party-advisory
- VulnCheck Advisory: TaxHacker through 0.8.5 IDOR via Settings Server Actions userId third-party-advisory