CVE-2026-125749
TaxHacker through 0.8.5 IDOR via Settings Server Actions userId
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| TaxHacker vas3k vas3k/TaxHacker
github |
≥ 0; ≤ 0.8.5 (affected, custom)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 2.3 low |
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 | CNA: VulnCheck |
| 3.1 / 4.2 medium |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L | CNA: VulnCheck |
Exploit evidence
- https://hackmd.io/@hieund/cve-2026-125749-taxhacker-settings-crud-actions-cross-user-authz
exploit · ADP: CISA-ADP
References
- https://github.com/vas3k/TaxHacker/issues/204CNA: VulnCheck · issue-tracking
- https://github.com/vas3k/TaxHacker/commit/d84a912f3a06b141cc275bb07115a204e7f10128CNA: VulnCheck · patch
- https://github.com/vas3k/TaxHacker/blob/v0.8.5/app/(app)/settings/actions.ts#L117-L306CNA: VulnCheck · technical-description
- https://hackmd.io/@hieund/taxhacker-settings-crud-actions-cross-user-authzCNA: VulnCheck · third-party-advisory
- https://www.vulncheck.com/advisories/taxhacker-through-0.8.5-idor-via-settings-server-actions-useridCNA: VulnCheck · third-party-advisory
- https://hackmd.io/@hieund/cve-2026-125749-taxhacker-settings-crud-actions-cross-user-authzADP: CISA-ADP · exploit
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