# CVE-2026-110765: FlexPrice through 2.1.38 QuickBooks Webhook Signature Verification Bypass

> Unauthenticated attackers can bypass webhook signature verification to forge payment notifications, marking invoices as paid or overpaid.

- **Severity:** High 8.2 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 14 Oct 2026
- **Also known as:** GHSA-mc76-h4x2-pgj7

## What is CVE-2026-110765?

CVE-2026-110765 is a high-severity authentication bypass vulnerability in flexprice, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-347 (Improper Verification of Cryptographic Signature)

## Which versions are affected by CVE-2026-110765?


## How do I fix CVE-2026-110765?

No fix has been published for CVE-2026-110765 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-110765 being exploited?

There is no known exploitation of CVE-2026-110765 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110765 and fix it if it is affected.

What it is: CVE-2026-110765 is a high-severity authentication bypass vulnerability in flexprice, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-110765 in the wild and no public exploit code.

Affected product: flexprice. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-110765/ (Markdown: https://insights.sbomify.com/CVE-2026-110765/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110765
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110765
- OSV: https://osv.dev/vulnerability/CVE-2026-110765

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-110765/
Summaries are generated and may contain mistakes; the official description above is the record.