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CVE-2026-13400— Simply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information

Quick assessment

Affected
Unknown Simply Schedule Appointments
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

nsqua simply schedule appointments是nsqua个人开发者开源的一个在线预约安排插件。 WordPress simply schedule appointments 1.6.12.2及之前版本存在跨站脚本漏洞，该漏洞源于清理顺序缺陷，导致渲染的通知内容在通过wp_kses_post()过滤后被解码回live HTML，双重编码的有效载荷在渲染时被执行，容易受到未经身份验证的存储型跨站脚本攻击。

AI Predicted 8.1 Difficulty: Easy EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProduct Version RangeStatus
Unknown Simply Schedule Appointments < 1.6.12.4 affected
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I. Basic Information for CVE-2026-13400

Vulnerability Information
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Vulnerability Title
Simply Schedule Appointments < 1.6.12.4 - Unauthenticated Stored XSS via Booking Customer Information
Source: CVE Program / CVE List V5
Vulnerability Description
Simply Schedule Appointments is vulnerable to unauthenticated Stored Cross-Site Scripting in all versions up to and including 1.6.12.2. The root cause is a sanitization-ordering defect: the rendered notification content is decoded back into live HTML after it has already passed through the Simply Schedule Appointments WordPress plugin before 1.6.12.4's wp_kses_post() filter, so a double-encoded payload survives intake and is reintroduced as an executable element at render time.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress simply schedule appointments 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
nsqua simply schedule appointments是nsqua个人开发者开源的一个在线预约安排插件。 WordPress simply schedule appointments 1.6.12.2及之前版本存在跨站脚本漏洞，该漏洞源于清理顺序缺陷，导致渲染的通知内容在通过wp_kses_post()过滤后被解码回live HTML，双重编码的有效载荷在渲染时被执行，容易受到未经身份验证的存储型跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Unknown Simply Schedule Appointments 0 ~ 1.6.12.4 -

II. Public POCs for CVE-2026-13400

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III. Intelligence Information for CVE-2026-13400

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Vendor Advisories for CVE-2026-13400 (1)

Same Patch Batch · Unknown · 2026-07-27 · 23 CVEs total

CVE-2026-13714 Realtyna Organic IDX plugin + WPL Real Estate < 5.3.0 - Unauthenticated Arbitrary File Upl
CVE-2026-14820 Quiz And Survey Master < 11.1.3 - Unauthenticated User Enumeration and Password Oracle via
CVE-2026-14827 Calendar < 1.3.18 - Contributor+ Stored XSS via event_link Parameter
CVE-2026-9830 BookingPress Pro < 5.7.3 - Unauthenticated Customer PII Disclosure and Booking Tampering v
CVE-2026-14203 Smart Manager < 8.92.0 - Contributor+ Stored XSS via Post Title
CVE-2026-14568 WP User Frontend < 4.3.8 - Unauthenticated Author-less Attachment Deletion
CVE-2026-14236 Contact Form 7 – PayPal & Stripe Add-on < 2.5 - Open Redirect
CVE-2026-14289 WP FacturaONE < 5.37 - Unauthenticated Remote Code Execution
CVE-2026-14235 WordPress Download Manager < 3.3.62 - Unauthorized Protected File Download via Reusable Do
CVE-2026-13597 QRcode Login for WeChat <= 1.3 - Unauthenticated Account Takeover
CVE-2026-13726 Multiple Page Generator Plugin – MPG < 4.1.8 - Reflected XSS via mpg_shortcode
CVE-2026-10082 Advanced Ads – Ad Manager & AdSense < 2.0.23 - Contributor+ Stored XSS via the_ad Shortcod
CVE-2026-14190 Sina Extension for Elementor < 3.10.2 - Reflected XSS
CVE-2026-14189 WPBot AI ChatBot < 8.5.2 - Admin+ Second-Order SQL Injection via qc_bot_str_fields
CVE-2026-13332 Masteriyo LMS < 2.3.1 - Unauthenticated Arbitrary User Session Termination (Denial of Serv
CVE-2026-13390 The Events Calendar < 6.16.5.1 - Unauthenticated Event Aggregator Import Status Manipulati
CVE-2026-13152 Custom Fields Account Registration For WooCommerce < 1.4 - Unauthenticated Privilege Escal
CVE-2026-12982 Document Gallery < 5.1.1 - Reflected XSS via dg_generate_gallery
CVE-2026-12255 MainWP Child < 6.1.2 - Unauthenticated Administrator Authentication Bypass via Passwordles
CVE-2026-12394 MemberGlut < 1.1.5 - Unauthenticated Privilege Escalation to Administrator

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Simply Schedule Appointments
Same vendor: Unknown

V. Comments for CVE-2026-13400

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