---
id: CVE-2026-71537
title: >-
  Paymenter is a free and open-source webshop solution for management of hosting
  services
summary: >-
  Paymenter is a free and open-source webshop solution for management of hosting
  services. Prior to 1.5.7, app/Livewire/Services/Upgrade.php::doUpgrade()
  relies on Service::upgradable to check for a pending service upgrade and later
  execut…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-362
vendor: Paymenter
product: Paymenter
affected:
  - Paymenter < 1.5.7
patched:
  - paymenter/paymenter 1.5.7
published: '2026-09-18'
updated: '2026-09-24'
sourceUpdated: '2026-09-24T21:18:25.987'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71537'
references:
  - url: >-
      https://github.com/Paymenter/Paymenter/commit/a42e7f8bafce054ad70de3a2c2ac94d13579f41b
    label: security-advisories@github.com
  - url: 'https://github.com/Paymenter/Paymenter/releases/tag/v1.5.7'
    label: security-advisories@github.com
  - url: >-
      https://github.com/Paymenter/Paymenter/security/advisories/GHSA-5gmm-hjfj-8ff7
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-5gmm-hjfj-8ff7'
tags:
  - nvd
  - cve.org
  - ghsa
  - composer
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-24T21:02:22.490189Z'
epss: 0.00325
epssPercentile: 0.2296
aliases:
  - GHSA-5gmm-hjfj-8ff7
ecosystem: composer
ingestedAt: '2026-09-18T17:46:41.535Z'
---

## Overview

Paymenter is a free and open-source webshop solution for management of hosting services. Prior to 1.5.7, app/Livewire/Services/Upgrade.php::doUpgrade() relies on Service::upgradable to check for a pending service upgrade and later executes $credit->increment('amount', abs($price)) without DB::transaction or lockForUpdate() spanning those operations. An authenticated customer with an active downgradable service can submit concurrent downgrade requests that each observe no pending upgrade, create separate upgrade records, and increment the same account credit balance, producing multiple spendable refunds for one downgrade. This issue is fixed in version 1.5.7.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-71537)

Affected packages:

- `paymenter/paymenter <= 1.5.6`

Patched in:

- `paymenter/paymenter 1.5.7`

Source: https://github.com/advisories/GHSA-5gmm-hjfj-8ff7