CVE-2026-110765
FlexPrice through 2.1.38 QuickBooks Webhook Signature Verification Bypass
CVSS Score
5.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-347 |
| Vendor | flexprice |
| Product | flexprice |
| Published | Oct 14, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Affected Versions
flexprice / flexprice
0 ≤ 2.1.38
References
hackmd.io: https://hackmd.io/@hieuPenguinnn/flexprice-quickbooks-webhook-signature-bypass github.com: https://github.com/flexprice/flexprice/blob/f27da32f84ee34bad4bf39a8d887af87fc3f30fc/internal/api/v1/webhook.go#L750 github.com: https://github.com/flexprice/flexprice vulncheck.com: https://www.vulncheck.com/advisories/flexprice-through-2.1.38-quickbooks-webhook-signature-verification-bypass
Credits
hieuPenguinnn