CVE-2026-1570: WordPress Simple Bible Verse XSS Flaw

CVE-2026-1570 Overview

CVE-2026-1570 is a Stored Cross-Site Scripting (XSS) vulnerability in the Simple Bible Verse via Shortcode plugin for WordPress. The flaw affects all plugin versions up to and including 1.1. The vulnerability exists in the plugin's verse shortcode, which fails to properly sanitize user-supplied attributes and escape output. Authenticated attackers with contributor-level access or higher can inject arbitrary JavaScript into pages. The injected scripts execute in the browser of any visitor who views the affected page. The issue is categorized under [CWE-79] (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Authenticated contributors can inject persistent JavaScript that executes against any visitor, enabling session theft, account takeover, and content manipulation.

Affected Products

Simple Bible Verse via Shortcode plugin for WordPress, all versions through 1.1
WordPress sites granting contributor-level or higher access to untrusted users
Any front-end page rendering the plugin's verse shortcode

Discovery Timeline

2026-02-07 - CVE-2026-1570 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-1570

Vulnerability Analysis

The Simple Bible Verse via Shortcode plugin registers a verse shortcode that accepts user-supplied attributes and renders them into page output. The plugin processes these attributes without applying WordPress sanitization functions such as sanitize_text_field() or esc_attr(). The rendered HTML therefore contains attacker-controlled content directly within the response body.

Because the shortcode output is persisted as part of post or page content, the payload is stored rather than reflected. Every visitor who loads the affected page triggers script execution under the site's origin. The exploitation requires contributor-level access, which WordPress grants to users permitted to author drafts. Sites accepting guest posts, multi-author publishing, or community submissions face the highest exposure.

The attack alters scope from the vulnerable component to the visitor's browser session, which is reflected in the scope-changed nature of the issue. Confidentiality and integrity impacts result from script-driven access to cookies, session tokens, and DOM content.

Root Cause

The root cause is insufficient input sanitization and missing output escaping inside the verse shortcode handler. Plugin source review at index.php line 40 in the WordPress plugin trunk shows attributes flowing into HTML output without encoding. See the WordPress Plugin Code Review for the affected code path.

Attack Vector

An authenticated attacker with contributor permissions creates or edits a post containing the verse shortcode with malicious attribute values. The attribute payload contains JavaScript wrapped in HTML attribute or tag syntax that escapes the rendered context. When the post is published or previewed by a privileged reviewer, the script runs in that user's browser. Administrators reviewing contributor submissions are typical targets for privilege escalation through this vector.

No verified proof-of-concept code is publicly available. Refer to the Wordfence Vulnerability Report for additional technical context.

Detection Methods for CVE-2026-1570

Indicators of Compromise

Posts or pages containing [verse] shortcode attributes with <script>, onerror, onload, or javascript: sequences
Unexpected JavaScript execution or redirects originating from pages that render Bible verse content
Newly created administrator accounts following contributor-authored post reviews
Outbound requests from administrator browser sessions to unknown domains while editing or previewing posts

Detection Strategies

Scan the wp_posts table for post content matching the verse shortcode combined with HTML event handlers or script tags
Monitor Content Security Policy (CSP) violation reports for inline script execution on pages using the plugin
Review recent contributor and author account activity, particularly post creation and edit events
Inspect plugin version metadata across WordPress installations to identify deployments at version 1.1 or earlier

Monitoring Recommendations

Enable WordPress audit logging for post creation, post updates, and user role changes
Forward web server access logs to a centralized analytics platform and alert on shortcode payloads containing script keywords
Track administrator session anomalies such as new sessions from unexpected IP addresses immediately after reviewing contributor posts

How to Mitigate CVE-2026-1570

Immediate Actions Required

Deactivate the Simple Bible Verse via Shortcode plugin until a patched version is available
Audit existing posts and pages for verse shortcode usage and remove suspicious attribute content
Restrict contributor-level account creation and review existing contributor accounts for legitimacy
Force password resets for administrator accounts that previewed or published contributor submissions

Patch Information

No vendor patch is referenced in the available CVE data. Site operators should monitor the Wordfence Vulnerability Report and the WordPress plugin repository for an updated release. Until a fix ships, removing the plugin is the recommended remediation.

Workarounds

Remove or disable the plugin on production sites
Deploy a Web Application Firewall (WAF) rule that blocks requests containing verse shortcode attributes with HTML or JavaScript metacharacters
Apply a strict Content Security Policy that disallows inline scripts and untrusted script sources
Limit contributor and author roles to vetted users and require editorial review before publishing

bash

# Disable the vulnerable plugin via WP-CLI
wp plugin deactivate simple-bible-verse-via-shortcode
wp plugin delete simple-bible-verse-via-shortcode

# Search post content for suspicious shortcode usage
wp db query "SELECT ID, post_title FROM wp_posts WHERE post_content LIKE '%[verse%' AND (post_content LIKE '%<script%' OR post_content LIKE '%onerror=%' OR post_content LIKE '%javascript:%');"