CVE-2026-7493— Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.11.5 - Unauthenticated Denial of Service
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-7493
Vulnerability Information
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Vulnerability Title
Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin <= 1.6.11.5 - Unauthenticated Denial of Service
Source: NVD (National Vulnerability Database)
Vulnerability Description
The Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin plugin for WordPress is vulnerable to denial of service in all versions up to, and including, 1.6.11.5. This is due to a publicly accessible REST API endpoint (/wp-json/ssa/v1/async) that calls PHP's sleep() function on a user-supplied delay parameter without any rate limiting. This makes it possible for unauthenticated attackers to exhaust PHP worker processes, denying access to the site to legitimate users.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| croixhaug | Appointment Booking Calendar — Simply Schedule Appointments Booking Plugin | 0 ~ 1.6.11.5 | - |
II. Public POCs for CVE-2026-7493
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-7493 (1)
Other References for CVE-2026-7493 (1)
IV. Related Vulnerabilities
- CVE-2026-4807
Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated A - CVE-2026-3658
Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated S - CVE-2026-3045
Appointment Booking Calendar <= 1.6.9.29 - Missing Authoriza - CVE-2026-1704
Appointment Booking Calendar <= 1.6.9.29 - Insecure Direct O - CVE-2026-1708
Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated S
Same vendor: croixhaug
- CVE-2026-4807
Appointment Booking Calendar <= 1.6.10.6 - Unauthenticated A - CVE-2026-3658
Appointment Booking Calendar <= 1.6.10.0 - Unauthenticated S - CVE-2026-3045
Appointment Booking Calendar <= 1.6.9.29 - Missing Authoriza - CVE-2026-1704
Appointment Booking Calendar <= 1.6.9.29 - Insecure Direct O - CVE-2026-1708
Appointment Booking Calendar <= 1.6.9.27 - Unauthenticated S
Same weakness: CWE-400
- CVE-2026-48593
Unbounded range expansion in cron describe causes memory exh - CVE-2026-8856
IBM HTTP Server is affected by multiple vulnerabilities - CVE-2026-47073
Unbounded memory consumption in WebSocket client in hackney - CVE-2026-47077
Unbounded body accumulation in HTTP/3 response loop in hackn - CVE-2026-47071
SOCKS5 TLS upgrade ignores caller timeout in hackney
V. Comments for CVE-2026-7493
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