# CVE-2026-17021: Salon Booking System missing authorization in booking AJAX actions

Source: https://junglewise.ai/threats/cve-2026-17021-salon-booking-system-missing-authorization-in-booking-ajax  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-17021 · Severity: medium · CVSS 5.3 · Published 2026-08-10

The Salon Booking System WordPress plugin allows unauthenticated attackers to modify booking totals through unprotected booking-modification features. An attacker can inflate or corrupt the recorded cost of any booking by directly calling WordPress AJAX endpoints, enabling them to steal revenue, apply unauthorized discounts, or create financial discrepancies in the business records.

Technologies: [Salon Booking System](https://junglewise.ai/threats/technologies/salon-booking-system). Vendors: [Salon Booking System](https://junglewise.ai/threats/vendors/salon-booking-system).

## Quick answers

**Is CVE-2026-17021 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-17021 being exploited in the wild.

**How severe is CVE-2026-17021?** Medium severity, with a CVSS score of 5.3, published 10 August 2026.

**Which products and versions are affected?** Salon Booking System before 10.30.34.

**Is there a fix for CVE-2026-17021?** A patch was published on 2026-08-10: Fixed in version 10.30.34 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-17021 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-17021?** Check whether you run Salon Booking System at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a broken access control (CWE-862) in the plugin's AJAX handlers for booking modifications. The applyTipsAmount and ApplyDiscountCode actions fail to verify user authentication and do not check booking ownership, accepting any attacker-supplied booking ID without authorization checks or CSRF tokens. An unauthenticated attacker can POST directly to wp-admin/admin-ajax.php with parameters like action=salon&method=applyTipsAmount&sln_booking_id=[target]&sln[tips]=[amount] to manipulate stored booking totals. The vulnerability affects versions before 10.30.34; it was patched in 10.30.34. Both the tips handler and discount handler (when the discount system is enabled, which is the default) are exploitable with no authentication, cookie, or nonce required.

## Affected products

- Salon Booking System Salon Booking System before 10.30.34

## Timeline

- 2026-08-06: disclosed
- 2026-08-10: patched: Fixed in version 10.30.34
- 2026-08-10: advisory

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://wpscan.com/vulnerability/fbbfa907-3efd-4050-9651-d3836af062a9/](https://wpscan.com/vulnerability/fbbfa907-3efd-4050-9651-d3836af062a9/)

## Related threats

- [The Salon Booking System missing authorization in REST API endpoint](https://junglewise.ai/threats/cve-2026-110035-the-salon-booking-system-wordpress-plugin-before-10-31-11-does)
- [Salon Booking System WordPress plugin SSRF and stored XSS in image URL](https://junglewise.ai/threats/cve-2026-110033-the-salon-booking-system-wordpress-plugin-before-10-31-11-does)
- [The Salon Booking System WordPress plugin insufficient access control in customer editor](https://junglewise.ai/threats/cve-2026-110032-the-salon-booking-system-wordpress-plugin-before-10-31-11-does)
- [The Salon Booking System plugin privilege escalation](https://junglewise.ai/threats/cve-2026-110031-the-salon-booking-system-wordpress-plugin-before-10-31-11-does)
- [Salon Booking System WordPress plugin CSRF in REST API](https://junglewise.ai/threats/cve-2026-110015-the-salon-booking-system-wordpress-plugin-before-10-31-9-does)