CVE-2025-6261 Overview
CVE-2025-6261 is a Stored Cross-Site Scripting (XSS) vulnerability in the Fleetwire Fleet Management plugin for WordPress. The flaw affects all versions up to and including 1.0.19. The vulnerability resides in the plugin's fleetwire_list shortcode, which fails to sanitize user-supplied attributes and does not escape output. Authenticated users with contributor-level access or higher can inject arbitrary web scripts into pages. Injected scripts execute in the browser of any visitor who loads the affected page. The issue is tracked under [CWE-79] Improper Neutralization of Input During Web Page Generation.
Critical Impact
Authenticated contributors can persist JavaScript payloads that execute against site administrators and visitors, enabling session theft, privilege escalation via administrative actions, and site defacement.
Affected Products
- Fleetwire Fleet Management plugin for WordPress — all versions through 1.0.19
- WordPress sites permitting contributor or higher registration
- Any WordPress installation that renders the fleetwire_list shortcode
Discovery Timeline
- 2025-07-23 - CVE-2025-6261 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-6261
Vulnerability Analysis
The Fleetwire Fleet Management plugin exposes a shortcode named fleetwire_list that accepts user-controlled attributes. When the shortcode renders, the plugin embeds these attributes directly into HTML output without applying WordPress sanitization functions such as sanitize_text_field() or escaping helpers such as esc_attr() and esc_html().
An attacker with contributor privileges can create a post or page containing the shortcode with a crafted attribute value carrying JavaScript. WordPress persists the shortcode inside post content. When any user, including administrators, opens the resulting page, the browser parses and executes the injected script under the site's origin.
The stored nature of this XSS makes it more impactful than reflected variants. Payloads persist in the database until removed, and every subsequent page view triggers execution. Attackers commonly leverage such flaws to exfiltrate cookies, perform CSRF against administrators, create rogue admin accounts through the REST API, or backdoor the site with malicious plugins.
Root Cause
The root cause is missing input sanitization and missing output escaping on shortcode attributes handled by the fleetwire_list implementation. WordPress does not automatically sanitize shortcode attributes; developers must call sanitize_* and esc_* functions on any attribute that reaches the DOM.
Attack Vector
Exploitation requires an authenticated account with contributor-level access or higher on the target WordPress site. The attacker publishes or submits content containing the fleetwire_list shortcode with malicious attribute values. Because the vulnerability crosses a privilege boundary — a contributor injects code that executes in an administrator's browser — the CVSS scope is marked as changed.
See the Wordfence Vulnerability Report for technical write-up and the WordPress Plugin Changeset Update for the corresponding fix.
Detection Methods for CVE-2025-6261
Indicators of Compromise
- Post or page content containing [fleetwire_list ...] shortcodes with attribute values that include <script>, on*= event handlers, or javascript: URIs.
- Unexpected wp_users entries with administrator role created shortly after a contributor account published content using the plugin.
- Outbound requests from administrator browsers to unfamiliar domains immediately after loading pages containing the shortcode.
Detection Strategies
- Query the wp_posts table for post_content LIKE '%[fleetwire_list%' and review each attribute value for HTML or JavaScript metacharacters.
- Enable a Content Security Policy (CSP) in report-only mode to surface inline script execution on pages rendered by the plugin.
- Correlate contributor-role account activity with subsequent administrative actions in the WordPress audit log.
Monitoring Recommendations
- Monitor creation of new contributor and author accounts, especially on sites with open registration.
- Alert on modifications to wp_options values such as siteurl, home, and active_plugins following page views by administrators.
- Log web application firewall (WAF) events for XSS signatures targeting shortcode attribute parameters.
How to Mitigate CVE-2025-6261
Immediate Actions Required
- Update the Fleetwire Fleet Management plugin to a version later than 1.0.19 as soon as the vendor publishes a patched release.
- Audit existing posts and pages for fleetwire_list shortcode usage and remove any suspicious attribute values.
- Review all contributor, author, and editor accounts and remove those that are unrecognized or inactive.
Patch Information
Refer to the WordPress Plugin Changeset Update for the code change addressing the sanitization gap, and consult the Fleetwire Management Plugin Info page for release information.
Workarounds
- Deactivate and remove the Fleetwire Fleet Management plugin until a fixed version is installed.
- Restrict contributor and author registration on sites that do not require public authoring.
- Deploy a WordPress-aware WAF rule that blocks shortcode attributes containing <, >, or javascript: sequences.
- Enforce a strict Content Security Policy that disallows inline scripts on the front-end.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
