CVE Alert: CVE-2025-8593 – westerndeal – GSheetConnector For Gravity Forms
CVE-2025-8593
The GSheetConnector For Gravity Forms plugin for WordPress is vulnerable to authorization bypass in versions less than, or equal to, 1.3.27. This is due to a missing capability check on the ‘install_plugin’ function. This makes it possible for authenticated attackers, with subscriber-level access and above to install plugins on the target site and potentially achieve arbitrary code execution on the server under certain conditions.
AI Summary Analysis
Risk verdict
High risk for affected WordPress sites; exploitation requires subscriber-level credentials, but could enable arbitrary code execution via unauthorized plugin installation.
Why this matters
Authenticated attackers can bypass key checks and install plugins, potentially running code on the server. In practice, this can lead to full site compromise, data exposure, or disruption, especially on hosts with login-enabled CMS and public admin interfaces.
Most likely attack path
An attacker with a subscriber+ or higher account triggers the vulnerable install_plugin flow lacking proper authorization checks, enabling plugin installation. With server-side code execution risk present, a malicious plugin could be deployed, potentially compromising integrity and confidentiality of site data. Given AV/NI/PR-L, no user interaction required beyond valid credentials, making automated or semi-automated attempts feasible within vulnerable environments.
Who is most exposed
WordPress sites using the GSheetConnector For Gravity Forms plugin, particularly on shared hosting or environments with broad admin access and weaker credential hygiene. Organisations relying on Gravity Forms integrations are most at risk.
Detection ideas
- Surges in plugin installation or activation attempts from subscriber+ accounts
- New or modified files under wp-content/plugins (especially related to Gravity Forms integration)
- Unexpected code paths or calls in install_plugin or plugin management logic
- Unusual admin activity logs or API endpoints invoked during off-hours
- Anomalous outbound requests from plugin code (e.g., to external services)
Mitigation and prioritisation
- Patch to a non-vulnerable plugin version or remove the vulnerable plugin if a fix isn’t available
- Enforce least privilege: restrict plugin installation to admins; disable editor access for non-admins
- Enforce MFA for all admin/subscriber accounts; review credential hygiene
- Implement IP/restriction controls and WAF rules around plugin management endpoints
- Establish change-management and continuous monitoring for plugin changes; test changes in staging before production
- If KEV is confirmed or EPSS ≥ 0.5, treat as priority 1 (data not provided here)
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