Vulnerability in Flexprice
CVE-2026-110765
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.
Published .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- hackmd.io/@hieuPenguinnn/flexprice-quickbooks-webhook-signature-bypass (technical-description, exploit)
- github.com/flexprice/flexprice/blob/f27da32f84ee34bad4bf39a8d887af87fc3f30fc/in… (technical-description)
- github.com/flexprice/flexprice (product)
- www.vulncheck.com/advisories/flexprice-through-2.1.38-quickbooks-webhook-signat… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110765?
- CVE-2026-110765 is a medium-severity vulnerability in Flexprice, classified under Improper Verification of Cryptographic Signature. CVSS score: 5.9/10. Published 2026-10-14.
- How severe is CVE-2026-110765?
- Medium severity. CVSS v3 base score is 5.9 out of 10.