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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
flexprice flexprice unaffected
Version Status Constraints
0 affected ≤ 2.1.38

No data.

No data.

No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/flexprice/flexprice cve-icon cve-icon
https://github.com/flexprice/flexprice/blob/f27da32f84ee34bad4bf39a8d887af87fc3f30fc/internal/api/v1/webhook.go#L750 cve-icon cve-icon
https://hackmd.io/@hieuPenguinnn/flexprice-quickbooks-webhook-signature-bypass cve-icon cve-icon
https://www.vulncheck.com/advisories/flexprice-through-2.1.38-quickbooks-webhook-signature-verification-bypass cve-icon cve-icon
History

Wed, 14 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
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.
Title FlexPrice through 2.1.38 QuickBooks Webhook Signature Verification Bypass
Weaknesses CWE-347
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.2, 'vector': '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'}

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-14T18:47:41.613Z

Reserved: 2026-10-14T17:27:32.591Z

Link: CVE-2026-110765

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-14T19:17:12.313

Modified: 2026-10-14T19:17:12.313

Link: CVE-2026-110765

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses