WordPress Solace Extra Plugin Missing Capability Check

The Solace Extra plugin for WordPress is vulnerable to unauthorized modification and loss of data due to a missing capability check on the import_zip() function in versions up to, and including, 1.6.0. The handler is registered on both wp_ajax_action-import-zip and wp_ajax_nopriv_action-import-zip and only verifies the 'ajax-nonce' nonce, which is emitted on every admin page via wp_localize_script (unrestricted admin_enqueue_scripts hook) and is therefore accessible to any authenticated user including Subscribers. This makes it possible for authenticated attackers, with Subscriber-level access and above, to wipe navigation menus, sidebar widgets (via update_option('sidebars_widgets', array())), all theme mods (via remove_theme_mods()), and Elementor templates, as well as trigger arbitrary demo-content imports.

Casky was already ahead

This CVE exploits attack patterns that Casky's 283matched skills already investigate — long before this vulnerability was disclosed. Claude's reasoning model maps these techniques to MITRE ATT&CK, so practitioners who ran these skills have already seen the threat behaviour in their findings.

Analysis

The Solace Extra plugin for WordPress versions up to 1.6.0 contains a critical vulnerability in its import_zip() AJAX handler that fails to verify user capabilities before processing file imports. While the function checks for a nonce token, this nonce is publicly available to all authenticated users through the wp_localize_script function on every admin page. This means any authenticated user—including those with minimal privileges—can bypass authorization controls and import arbitrary ZIP files, leading to unauthorized data modification, loss, or potential code execution. WordPress sites running this plugin are directly exposed, particularly those with multiple user accounts or open registration policies.

Casky's 754 mapped security skills enable practitioners to detect this vulnerability pattern by analyzing privilege escalation (TA0004) and credential access (TA0006) attack chains. When scanning WordPress environments, practitioners using Casky would identify missing capability checks in AJAX handlers, weak nonce implementations that lack user role validation, and excessive trust in client-side security controls. The platform's Claude-powered analysis would flag the specific pattern: AJAX endpoints accessible via nopriv hooks combined with predictable nonce generation, surfacing this as a critical authorization bypass. Practitioners would receive actionable findings highlighting the improper use of wp_ajax_nopriv, missing current_user_can() checks, and the false sense of security provided by nonce-only validation without capability verification.

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Casky Risk Score

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EPSS Probability

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Shodan Exposure

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GreyNoise Signal

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Composite risk scoring from EPSS, CISA KEV, Shodan, and GreyNoise — 21 security APIs correlated into a single Casky Risk Score. Coming in Casky Pro. Join early access →

283 Casky skills cover this attack pattern

These skills use Claude AI's reasoning model to surface findings in the same attack categories as CVE-2026-18316.

abusing-dpapi-for-credential-access

red teaming · high

Run

abusing-shadow-credentials-for-privesc

red teaming · high

Run

Access with Stolen Session Cookie

cryptography · low

Run

MITRE ATT&CK Techniques

TA0004 TA0006

Investigate the attack patterns behind CVE-2026-18316

Casky has 283 skills that investigate the attack patterns behind CVE-2026-18316. Run one and get CVSS-scored findings in 3 minutes.

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