CVE-2026-110765
FlexPrice through 2.1.38 QuickBooks Webhook Signature Verification Bypass
- State
- Published
- Severity
- 8.2 High
- Published
- Oct 14, 2026
- Updated
- Oct 14, 2026
- Reserved
- Oct 14, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.2 High | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.9 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N | VulnCheck |
Weaknesses
- CWE-347 Improper Verification of Cryptographic Signature
Affected Products
| Product | Versions |
|---|---|
flexpriceflexprice |
|
References
- https://hackmd.io/@hieuPenguinnn/flexprice-quickbooks-webhook-signature-bypasstechnical-descriptionexploit
- https://github.com/flexprice/flexprice/blob/f27da32f84ee34bad4bf39a8d887af87fc3f30fc/internal/api/v1/webhook.go#L750technical-description
- https://github.com/flexprice/flexpriceproduct
- VulnCheck Advisory: FlexPrice through 2.1.38 QuickBooks Webhook Signature Verification Bypassthird-party-advisory
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