---
id: CVE-2026-110765
title: >-
  FlexPrice through 2.1.38 contains an authentication bypass vulnerability in
  HandleQuickBooksWebhook that skips signature verification when the
  intuit-signature header is omitted
summary: >-
  FlexPrice through 2.1.38 contains an authentication bypass vulnerability in
  HandleQuickBooksWebhook that skips signature verification when the
  intuit-signature header is omitted. Unauthenticated attackers knowing a tenant
  and environment…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-347
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T19:17:12.313'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110765'
references:
  - url: 'https://github.com/flexprice/flexprice'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/flexprice/flexprice/blob/f27da32f84ee34bad4bf39a8d887af87fc3f30fc/internal/api/v1/webhook.go#L750
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@hieuPenguinnn/flexprice-quickbooks-webhook-signature-bypass
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/flexprice-through-2.1.38-quickbooks-webhook-signature-verification-bypass
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-14T19:49:57.610Z'
vendor: flexprice
product: flexprice
affected:
  - flexprice <= 2.1.38
---

## Overview

FlexPrice through 2.1.38 contains an authentication bypass vulnerability in HandleQuickBooksWebhook that skips signature verification when the intuit-signature header is omitted. Unauthenticated attackers knowing a tenant and environment ID can replay forged payment notifications to repeatedly add payment amounts, marking invoices paid or overpaid.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.