CVE-2026-24547 Overview
CVE-2026-24547 is an unauthenticated broken access control vulnerability in the SiteGround Email Marketing plugin for WordPress. The flaw affects versions 1.7.5 and below. Remote attackers can reach protected functionality without providing credentials, resulting in unauthorized modification of plugin data.
The weakness is classified under CWE-862: Missing Authorization. Exploitation requires no user interaction and no privileges. Patchstack published the vulnerability in its WordPress vulnerability database.
Critical Impact
An unauthenticated remote attacker can invoke restricted plugin actions over the network, leading to limited integrity impact on affected WordPress sites running the SiteGround Email Marketing plugin.
Affected Products
- SiteGround Email Marketing plugin for WordPress, versions 1.7.5 and prior
- WordPress sites with the plugin activated and network-accessible
- Any hosting environment exposing the plugin's endpoints to the internet
Discovery Timeline
- 2026-06-26 - CVE-2026-24547 published to NVD
- 2026-06-26 - Last updated in NVD database
Technical Details for CVE-2026-24547
Vulnerability Analysis
The vulnerability stems from missing authorization checks on one or more plugin endpoints in SiteGround Email Marketing <= 1.7.5. WordPress plugins commonly expose actions through admin-ajax.php, REST routes, or admin-post.php handlers. When these handlers lack capability checks (current_user_can()) or nonce validation (check_ajax_referer()), unauthenticated visitors can trigger them.
The CWE-862 classification confirms the root issue is missing authorization rather than a bypass of an existing check. The attack requires only network access to the target site. No account, token, or user interaction is needed.
The impact is limited to integrity, with no confidentiality or availability effects reported. This suggests the accessible functionality permits state changes such as modifying plugin settings, subscriber records, or campaign configuration, but does not directly expose sensitive data or crash the application.
Root Cause
The root cause is an absent or insufficient authorization guard on a plugin action. The handler executes its logic without confirming the caller holds the required WordPress capability. See the Patchstack Vulnerability Report for the vendor-specific handler details.
Attack Vector
An attacker sends a crafted HTTP request to the exposed plugin endpoint on a vulnerable WordPress site. Because the handler skips authorization, the request executes with the privileges the plugin logic assumes. This can be automated at scale against WordPress sites indexed as running the plugin.
No verified proof-of-concept code is published. Refer to the Patchstack advisory for the specific action name and parameters.
Detection Methods for CVE-2026-24547
Indicators of Compromise
- Unauthenticated POST requests to /wp-admin/admin-ajax.php or plugin-specific REST routes referencing SiteGround Email Marketing actions
- Unexpected changes to plugin configuration, subscriber lists, or campaign data without a corresponding administrator login
- Access log entries from anonymous sources hitting plugin endpoints with valid action parameters
Detection Strategies
- Inventory WordPress installations and flag any running SiteGround Email Marketing <= 1.7.5
- Alert on high volumes of anonymous requests to admin-ajax.php targeting plugin-specific action names
- Correlate plugin configuration changes with authenticated administrator sessions to catch unauthorized modifications
Monitoring Recommendations
- Ingest WordPress access and audit logs into a centralized SIEM for behavioral analysis
- Enable WordPress plugin file integrity monitoring on production sites
- Track plugin version drift across managed WordPress fleets to identify unpatched instances quickly
How to Mitigate CVE-2026-24547
Immediate Actions Required
- Update the SiteGround Email Marketing plugin to a version above 1.7.5 as soon as the vendor patch is available
- Audit WordPress admin logs for signs of unauthorized configuration changes since the plugin was installed
- Restrict access to wp-admin and admin-ajax.php from untrusted networks where feasible
Patch Information
Consult the Patchstack Vulnerability Report for the fixed version and vendor guidance. Apply the update through the WordPress plugin manager or by deploying the patched release across your fleet.
Workarounds
- Deactivate and remove the SiteGround Email Marketing plugin until a patched version is deployed
- Deploy a web application firewall rule blocking anonymous requests to the plugin's vulnerable action endpoints
- Enforce IP allow-listing on /wp-admin/ paths through the web server or reverse proxy
# Example WordPress CLI check for affected plugin version
wp plugin get siteground-email-marketing --field=version
wp plugin update siteground-email-marketing
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
