CVE-2026-57674: Timetics XSS Vulnerability

CVE-2026-57674 Overview

CVE-2026-57674 is an unauthenticated Cross-Site Scripting (XSS) vulnerability affecting the Timetics WordPress plugin in versions up to and including 1.0.58. The flaw is classified under [CWE-79] (Improper Neutralization of Input During Web Page Generation). Attackers can inject malicious script content that executes in the browser of any user who interacts with the crafted request. Because exploitation requires no authentication, any anonymous visitor can attempt the attack. The scope is marked as changed, meaning injected script can affect resources beyond the vulnerable component, including administrative sessions.

Critical Impact
Unauthenticated attackers can inject arbitrary JavaScript into pages served by the Timetics plugin, potentially hijacking sessions, stealing tokens, or redirecting WordPress administrators to attacker-controlled infrastructure.

Affected Products

Timetics WordPress plugin versions 1.0.58 and earlier
WordPress sites with the Timetics booking/appointment plugin installed and activated
Any front-end pages rendering unsanitized Timetics plugin output

Discovery Timeline

2026-07-02 - CVE-2026-57674 published to NVD
2026-07-02 - Last updated in NVD database

Technical Details for CVE-2026-57674

Vulnerability Analysis

The vulnerability resides in the Timetics plugin's handling of user-supplied input rendered back to the browser. The plugin fails to properly neutralize characters that carry meaning in HTML and JavaScript contexts before output. As a result, attacker-controlled data is reflected or stored into pages executed as active script content. The issue requires user interaction, typically clicking a crafted link or visiting a poisoned page. Successful exploitation runs in the trust context of the victim's WordPress origin, exposing cookies, DOM data, and authenticated actions.

Root Cause

The root cause is missing or insufficient output encoding on parameters processed by the Timetics plugin. Input flows from untrusted request data into an HTML rendering path without contextual escaping via functions such as esc_html(), esc_attr(), or wp_kses(). This classic [CWE-79] pattern allows script tags, event handlers, and JavaScript URIs to survive processing and execute in the browser.

Attack Vector

An attacker crafts a URL or form submission containing a JavaScript payload targeting a vulnerable Timetics endpoint. The attacker delivers the link through phishing, forum posts, or malicious advertising. When a WordPress user, including an administrator, loads the crafted request, the injected script executes under the site's origin. The attacker can then exfiltrate session cookies, perform authenticated actions on behalf of the victim, or pivot to further compromise.

// No verified proof-of-concept code is published for CVE-2026-57674.
// Refer to the Patchstack advisory linked in the References for technical details.

Detection Methods for CVE-2026-57674

Indicators of Compromise

Web server access logs containing Timetics plugin request parameters with <script>, onerror=, javascript:, or URL-encoded equivalents such as %3Cscript%3E
Outbound requests from browsers loading WordPress admin pages to unknown domains shortly after visiting Timetics-related URLs
Unexpected creation of administrative accounts or modification of user roles following visits to Timetics booking pages
Referer headers pointing to attacker-controlled domains in Timetics endpoint requests

Detection Strategies

Deploy Web Application Firewall rules that flag script-injection patterns in query strings and POST bodies destined for /wp-content/plugins/timetics/ and related REST routes
Monitor WordPress audit logs for anomalous administrative actions correlated with front-end visits to booking pages
Inspect stored plugin data (booking notes, custom fields) for HTML tags or JavaScript event handlers that should not appear in legitimate content

Monitoring Recommendations

Enable and centralize WordPress plugin activity logging, forwarding events to a SIEM for correlation
Alert on Content Security Policy (CSP) violation reports originating from pages rendered by the Timetics plugin
Track plugin version inventory across all WordPress instances to identify hosts still running 1.0.58 or earlier

How to Mitigate CVE-2026-57674

Immediate Actions Required

Update the Timetics plugin to the version released after 1.0.58 that addresses this XSS flaw
If a patched release is not yet available for your environment, deactivate and remove the Timetics plugin until a fix is deployed
Rotate WordPress administrator passwords and invalidate active sessions on any site suspected of exposure
Review recent administrative activity for signs of unauthorized changes made through hijacked sessions

Patch Information

Refer to the Patchstack Timetics Plugin XSS Advisory for vendor-supplied patch details and the fixed version. Apply plugin updates through the WordPress admin dashboard or via WP-CLI as soon as testing permits.

Workarounds

Enforce a strict Content Security Policy that disallows inline scripts and untrusted script sources on WordPress front-end and admin pages
Deploy WAF virtual patching rules that block requests containing HTML or JavaScript metacharacters against Timetics endpoints
Restrict access to booking pages behind authentication or IP allowlists where business requirements permit

bash

# Update Timetics plugin using WP-CLI once a fixed version is available
wp plugin update timetics --path=/var/www/html

# Alternatively, deactivate the plugin until patched
wp plugin deactivate timetics --path=/var/www/html