CVE-2025-30836 Overview
CVE-2025-30836 is a stored cross-site scripting (XSS) vulnerability in the LatePoint booking plugin for WordPress. The flaw affects all versions of LatePoint up to and including 5.1.6. The vulnerability stems from improper neutralization of user input during web page generation, categorized as [CWE-79].
An authenticated attacker with low privileges can inject persistent JavaScript payloads that execute in the browser of any user who views the affected page. Successful exploitation requires user interaction and results in a scope change, allowing attackers to impact resources beyond the vulnerable component.
Critical Impact
Stored XSS payloads persist in the LatePoint plugin data and execute against administrators or other users, enabling session hijacking, credential theft, and unauthorized actions within the WordPress environment.
Affected Products
- LatePoint WordPress Plugin versions up to and including 5.1.6
- WordPress sites running the LatePoint appointment booking plugin
- Any WordPress environment integrating LatePoint for scheduling workflows
Discovery Timeline
- 2025-03-27 - CVE-2025-30836 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-30836
Vulnerability Analysis
The vulnerability exists in the LatePoint plugin's handling of user-supplied input rendered back into web pages. The plugin fails to sanitize or encode input before writing it to HTML output. This allows an attacker to store JavaScript payloads inside plugin-managed fields, such as booking-related data or configuration fields accessible to low-privileged users.
When an administrator or another user later loads the page containing the stored payload, the browser interprets the injected content as executable script. Because this is a stored XSS variant, the payload persists across sessions and executes automatically for every viewer of the affected page.
Exploitation requires an authenticated account with low privileges and interaction from a victim user. The scope change reflected in the CVSS vector indicates that the injected script can affect data or sessions outside the plugin's direct security boundary, including the broader WordPress administrative context.
Root Cause
The root cause is missing or insufficient output encoding of user-controlled input rendered within the LatePoint plugin's HTML responses. The plugin does not enforce context-aware sanitization functions such as WordPress core's esc_html(), esc_attr(), or wp_kses() on affected fields before rendering them.
Attack Vector
An attacker with a low-privileged authenticated account submits crafted input containing HTML or JavaScript payloads through LatePoint plugin functionality. The payload is stored server-side. When a victim, typically an administrator, browses the plugin interface that renders the tainted data, the script executes in the victim's browser context.
The vulnerability mechanism is documented in the Patchstack LatePoint XSS Vulnerability advisory. No public proof-of-concept code is currently available.
Detection Methods for CVE-2025-30836
Indicators of Compromise
- Unexpected <script> tags, javascript: URIs, or HTML event handlers such as onerror= and onclick= stored inside LatePoint database tables
- Outbound HTTP requests from administrator browser sessions to unfamiliar domains shortly after accessing LatePoint pages
- New or modified WordPress administrator accounts created without a documented change request
- Anomalous session tokens or cookies exfiltrated from wp-admin sessions
Detection Strategies
- Review LatePoint plugin database tables for stored content containing HTML tags, script elements, or encoded JavaScript payloads
- Inspect web server access logs for POST requests to LatePoint endpoints originating from low-privileged accounts
- Correlate authentication events with subsequent administrative actions triggered from the same session to identify hijacked sessions
Monitoring Recommendations
- Enable WordPress audit logging for plugin configuration changes and content submissions
- Monitor Content Security Policy (CSP) violation reports for inline script execution on LatePoint-rendered pages
- Alert on creation of new administrator accounts or role escalations following LatePoint page views
How to Mitigate CVE-2025-30836
Immediate Actions Required
- Upgrade LatePoint to a version later than 5.1.6 once the vendor releases a fixed release
- Audit existing LatePoint records for stored HTML or JavaScript content and remove malicious entries
- Rotate WordPress administrator credentials and invalidate active sessions if compromise is suspected
- Restrict LatePoint low-privilege account creation and review permissions granted to booking-related roles
Patch Information
Refer to the Patchstack LatePoint XSS Vulnerability advisory for the latest patch status. Apply the vendor-supplied update as soon as a version above 5.1.6 becomes available.
Workarounds
- Deploy a Web Application Firewall (WAF) rule that blocks HTML and JavaScript payloads submitted to LatePoint endpoints
- Enforce a strict Content Security Policy that disallows inline scripts within the WordPress administrative interface
- Temporarily disable the LatePoint plugin on production sites until a patched version is installed
- Limit access to WordPress administrative pages by IP allowlisting where feasible
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.