CVE-2025-8105: Soledad WordPress Theme RCE Vulnerability

CVE-2025-8105 Overview

CVE-2025-8105 is an arbitrary shortcode execution vulnerability affecting the Soledad theme for WordPress in all versions up to and including 8.6.7. The flaw exists because the theme calls do_shortcode on user-supplied input without proper validation. Unauthenticated attackers can send crafted requests over the network to execute arbitrary WordPress shortcodes on a vulnerable site. The issue is classified under CWE-94 (Improper Control of Generation of Code).

Critical Impact

Unauthenticated remote attackers can invoke arbitrary shortcodes, potentially abusing privileged shortcodes from the theme or other installed plugins to disclose data, render attacker content, or trigger unintended server-side actions.

Affected Products

• Soledad WordPress theme versions <= 8.6.7
• WordPress sites distributed via ThemeForest Soledad listing
• Any WordPress deployment using Soledad together with shortcode-enabled plugins

Discovery Timeline

• 2025-08-16 - CVE-2025-8105 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2025-8105

Vulnerability Analysis

The Soledad theme exposes an action handler that passes request-supplied data to WordPress's do_shortcode function without validating or restricting the shortcode name or attributes. Because the handler is reachable without authentication, any visitor can submit a payload that causes the WordPress shortcode parser to execute registered shortcodes on the attacker's behalf.

WordPress shortcodes are server-side handlers registered by themes and plugins. Several common plugins register shortcodes that read database records, render private content, send email, or interact with other site features. Allowing arbitrary invocation collapses the trust boundary that normally restricts shortcode execution to authorized post authors and editors.

The impact depends on which shortcodes are registered on a given site, which is why the CVSS impact subscores are partial across confidentiality, integrity, and availability rather than full. The EPSS probability is 0.697% at the 72nd percentile, indicating elevated likelihood of exploit activity for an internet-facing WordPress component.

Root Cause

The root cause is missing input validation before a call to do_shortcode. The vulnerable action does not constrain the shortcode tag to a fixed allowlist, does not verify a nonce, and does not require an authenticated capability check. This combination converts a benign rendering helper into an unauthenticated code generation primitive [CWE-94].

Attack Vector

Exploitation requires only a network request to the WordPress site, typically against the admin-ajax.php endpoint or a similar action route exposed by the theme. The attacker supplies a shortcode string referencing any shortcode tag registered in the WordPress runtime. The server parses the input and executes the corresponding shortcode handler, returning its output to the attacker. No user interaction or prior session is required.

A detailed write-up of the flaw is available in the Wordfence Vulnerability Report. No public proof-of-concept code has been verified at the time of writing.

Detection Methods for CVE-2025-8105

Indicators of Compromise

• Unauthenticated POST requests to admin-ajax.php with action parameters tied to Soledad and payloads containing [ and ] shortcode delimiters
• Bursts of identical AJAX requests from a single source IP testing different shortcode tags
• HTTP responses returning content that maps to internal shortcode output (form fields, user lists, file paths) for unauthenticated callers
• New or unexpected outbound HTTP calls originating from php-fpm or the web server process correlating with inbound theme requests

Detection Strategies

• Review web server access logs for unauthenticated requests to theme action handlers containing URL-encoded %5B and %5D characters indicative of shortcode payloads
• Monitor WordPress debug logs and PHP error logs for shortcode handlers executing without an authenticated user context
• Compare the installed Soledad theme version against 8.6.7 and flag any host at or below that version as exposed

Monitoring Recommendations

• Enable a Web Application Firewall (WAF) ruleset that inspects POST bodies and query strings for shortcode syntax targeting Soledad action endpoints
• Forward WordPress and web server logs to a centralized analytics platform and alert on anomalous AJAX action volume per source IP
• Track file integrity for wp-content/themes/soledad/ to detect tampering following exploitation attempts

How to Mitigate CVE-2025-8105

Immediate Actions Required

• Update the Soledad theme to a version newer than 8.6.7 as published in the ThemeForest Update Changelog
• Audit the list of registered shortcodes on the site and remove or restrict any that expose sensitive data or perform privileged actions
• Restrict access to admin-ajax.php and theme action endpoints behind a WAF until the patched theme version is deployed
• Review access logs for prior exploitation attempts and rotate any credentials or tokens that could have been disclosed through shortcode output

Patch Information

The vendor has released an updated Soledad theme version that adds validation before invoking do_shortcode. Customers should obtain the latest build through their ThemeForest account and follow the upgrade steps in the ThemeForest Update Changelog. Confirm the active theme version in the WordPress admin under Appearance → Themes after upgrade.

Workarounds

• Deploy WAF signatures that block unauthenticated POST requests containing shortcode delimiters to Soledad-specific action names
• Temporarily disable the Soledad theme and switch to a default WordPress theme on sites that cannot be patched immediately
• Remove unused shortcode-providing plugins to reduce the attack surface available through the vulnerable handler

# Example: block shortcode payloads at the web tier with an nginx rule
location = /wp-admin/admin-ajax.php {
    if ($request_method = POST) {
        set $block 0;
        if ($request_body ~* "\[/?[a-z0-9_-]+(\s|\])") { set $block 1; }
        if ($arg_action ~* "soledad") { set $block "${block}1"; }
        if ($block = "11") { return 403; }
    }
    include fastcgi_params;
    fastcgi_pass php_upstream;
}