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WP Time Slots Booking Form CVE-2026-40791

| EUVDEUVD-2026-36994 HIGH
Cross-site Scripting (XSS) (CWE-79)
2026-06-15 Patchstack GHSA-hp53-p4r8-2m96
7.1
CVSS 3.1 · Vendor: Patchstack
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Identify site running vulnerable plugin
  2. Delivery
    Craft XSS payload for booking parameter
  3. Exploit
    Deliver link to admin or visitor
  4. Execution
    Victim browser renders injected script
  5. Persist
    Script executes in WordPress origin
  6. Impact
    Hijack session or perform admin actions

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Exploitation Conditions

Exploitation requires a WordPress site running the codepeople WP Time Slots Booking Form plugin at version 1.2.46 or earlier with the booking form exposed on a public page, and per the CVSS vector requires victim user interaction (UI:R) such as clicking an attacker-crafted link or visiting a page containing injected content. No authentication is required of the attacker (PR:N), the attack is delivered over the network (AV:N) at low complexity (AC:L), and impact is constrained by the victim's privileges in the WordPress origin - highest impact occurs when an administrator or editor is the one tricked into triggering the payload.

Impact

The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L scores 7.1 (High) primarily because of the scope change (S:C) - injected script runs against the WordPress origin including potentially logged-in administrator sessions - but exploitation requires user interaction (UI:R), which lowers practical risk versus a no-interaction RCE. There is no KEV listing, no public EPSS score provided in the input, and no public exploit identified at time of analysis, so this is a real but not emergency-priority issue: highest risk is to sites whose admins or editors view attacker-controlled booking content. No EPSS or POC data is available in the provided intelligence, so widespread automated exploitation cannot be confirmed or ruled out from this dataset alone.

Exploit ScenarioDerived

An unauthenticated attacker crafts a URL or booking-form submission containing a malicious JavaScript payload targeting the vulnerable plugin parameter and lures a site administrator or visitor to click the link or view the affected page. When the victim's browser renders the response, the script executes in the WordPress site origin and can steal session cookies, perform actions as the logged-in user, or pivot to admin takeover; no public exploit identified at time of analysis.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 15, 2026

Reflected/stored cross-site scripting in the WP Time Slots Booking Form WordPress plugin (versions up to and including 1.2.46) lets remote unauthenticated attackers inject script that executes in a victim's browser after user interaction. The flaw, reported by Patchstack and tracked as EUVD-2026-36994, carries a CVSS 7.1 due to the scope change against the WordPress origin, and no public exploit identified at time of analysis.

RemediationAI

Upstream fix available per Patchstack advisory; released patched version not independently confirmed from the provided data, so administrators should upgrade WP Time Slots Booking Form to the latest version newer than 1.2.46 as published by codepeople and tracked at https://patchstack.com/database/wordpress/plugin/wp-time-slots-booking-form/vulnerability/wordpress-wp-time-slots-booking-form-plugin-1-2-46-cross-site-scripting-xss-vulnerability. As compensating controls until the plugin is updated, deactivate the WP Time Slots Booking Form plugin on production sites (side effect: booking functionality is unavailable), restrict access to pages embedding the booking form via authentication or IP allowlist where feasible, and enable a WAF rule or Patchstack mitigation that blocks script tags and common XSS payloads in plugin request parameters (side effect: may produce false positives against legitimate form content containing HTML).

Affected VersionsENISA

WP Time Slots Booking Form n/a ≤1.2.46

Affected Packages

euvd wp_time_slots_booking_form no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

The vulnerable component is the codepeople 'WP Time Slots Booking Form' plugin for WordPress (CPE cpe:2.3:a:codepeople:wp_time_slots_booking_form), which provides time-slot reservation forms on WordPress sites. The weakness is CWE-79 (Improper Neutralization of Input During Web Page Generation), meaning user-supplied input handled by the plugin's booking or form-rendering logic is reflected or stored without proper output encoding or input sanitization, allowing HTML/JavaScript injection in the context of the WordPress site origin.

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  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (Patchstack) PRIMARY 7.1 HIGH
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
vuln.today AI 7.1 HIGH

Network-reachable WordPress plugin, no attacker auth (PR:N), requires victim click (UI:R); scope changes to WordPress origin (S:C) with limited C/I/A in the victim's session.

3.1 AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N

Primary rating from Vendor (Patchstack).

CVSS VectorVendor: Patchstack

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

DescriptionCVE.org

Unauthenticated Cross Site Scripting (XSS) in WP Time Slots Booking Form <= 1.2.46 versions.

Executive ViewAI

Why It Matters

The WP Time Slots Booking Form WordPress plugin (versions ≤1.2.46) contains an unauthenticated cross-site scripting vulnerability (CVE-2026-40791, CVSS 7.1) allowing remote attackers to inject malicious scripts executed in user browsers upon interaction. No public exploit identified at time of analysis; however, the plugin's accessibility to unauthenticated users creates substantial risk of session hijacking, credential theft, and malware distribution affecting customers and employees. Immediate mitigation is critical pending patch availability.

Business Impact: High
Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: (1) Immediately disable or remove affected plugin versions from production; (2) If removal is operationally infeasible, implement WAF rules to block script injection patterns on plugin endpoints; (3) Deploy strict Content Security Policy (CSP) headers with script-src restrictions; (4) Restrict plugin form access to authenticated users only where possible; (5) Enable comprehensive WordPress security logging and intrusion detection for exploitation attempts; (6) Identify and stage alternative, actively maintained booking solutions for rapid switchover.

Threat Intelligence Overview

EPSS Score
0.2%
Top 89% exploitable
Data Quality
6 sources
Confidence: High

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.2%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Partial

Priority Score

36
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +36
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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