# CVE-2026-81649: Fundiin <= 3.4.0 - Unauthenticated Payment Gateway Settings Update and Credential Disclosure

> Unauthenticated attackers can access payment credentials, modify gateway settings, and inject stored XSS due to missing authorization on REST API routes.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 11 Oct 2026
- **Updated:** 11 Oct 2026
- **Also known as:** GHSA-v54w-6hqg-rx6f

## What is CVE-2026-81649?

CVE-2026-81649 is a critical missing authorization vulnerability in Unknown Fundiin cho WooCommerce, published on 11 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Fundiin cho WooCommerce WordPress plugin through 3.4.0 does not have proper authorisation on several of its REST API routes, relying instead on a credential that is identical on every installation, allowing unauthenticated attackers to disclose the store's payment credentials and customer order data, overwrite the payment gateway configuration so that payments are credited elsewhere, and mark unpaid orders as paid. The same missing authorisation also allows arbitrary script to be stored in a field which is output unescaped on the classic checkout, leading to unauthenticated stored XSS on stores that do not use the block-based checkout.

Weakness: CWE-863 (Incorrect Authorization)

## Which versions are affected by CVE-2026-81649?


## How do I fix CVE-2026-81649?

No fix has been published for CVE-2026-81649 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-81649 being exploited?

There is no known exploitation of CVE-2026-81649 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-81649 and fix it if it is affected.

What it is: CVE-2026-81649 is a critical missing authorization vulnerability in Unknown Fundiin cho WooCommerce, published on 11 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-2026-81649 in the wild and no public exploit code.

Affected product: Unknown Fundiin cho WooCommerce. 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-2026-81649/ (Markdown: https://insights.sbomify.com/CVE-2026-81649/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-81649
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-81649
- OSV: https://osv.dev/vulnerability/CVE-2026-81649

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-81649/
Summaries are generated and may contain mistakes; the official description above is the record.