TAXHACKER · CVE-2026-125749 · Other
NO FIX YET · SEE WHAT TO DO
TaxHacker through 0.8.5 trusts a user ID supplied in a request, so a logged-in user can act on another user's records. An attacker can delete categories, clear transaction assignments, or alter LLM prompts belonging to a victim.
first public Nov 10, 2026 · 1 source
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Teams that self-host TaxHacker with multiple user accounts are exposed, since any authenticated user can target another user's UUID. Single-user installs have little other-user data to reach, and instances without open sign-up limit who can authenticate.
Not affected if no-open-signup, single-user
Who cares nextjs, self-hosted, taxhacker
0.8.5 are affected.app/(app)/settings/actions.ts for server actions that take a userId from the request instead of the session.0.8.5; the sources do not name the exact fixed version.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.
This page as .md · .json · CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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