CVE-2025-62733 Overview
CVE-2025-62733 is a Cross-Site Request Forgery (CSRF) vulnerability in the Custom Sidebars by ProteusThemes WordPress plugin. The flaw affects all versions of the custom-sidebars-by-proteusthemes plugin up to and including 1.0.3. An attacker can trick an authenticated WordPress user into submitting a forged request that performs unintended state-changing actions in the plugin. The issue is tracked under CWE-352 and requires user interaction to succeed. Successful exploitation impacts integrity but does not directly expose confidential data or degrade availability.
Critical Impact
An authenticated WordPress administrator visiting an attacker-controlled page can be forced to execute unintended plugin actions without their consent.
Affected Products
- ProteusThemes Custom Sidebars by ProteusThemes plugin for WordPress
- All versions from n/a through 1.0.3
- WordPress sites with the custom-sidebars-by-proteusthemes plugin installed and active
Discovery Timeline
- 2025-12-09 - CVE-2025-62733 published to NVD
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-62733
Vulnerability Analysis
The Custom Sidebars by ProteusThemes plugin fails to enforce anti-CSRF protections on one or more of its state-changing endpoints. WordPress provides a nonce mechanism through wp_nonce_field() and check_admin_referer() to bind sensitive requests to an authenticated session. When a plugin omits these checks, any browser session with an active WordPress login can be coerced into issuing plugin requests originating from an external site. Exploitation of CVE-2025-62733 requires the victim to be authenticated in WordPress and to interact with attacker-controlled content, such as a crafted link or a hidden form. The vulnerability produces a limited integrity impact, consistent with attacker-influenced plugin state changes rather than full site takeover.
Root Cause
The root cause is missing or improperly validated CSRF tokens on plugin request handlers in versions up to 1.0.3. Because the plugin trusts authenticated session cookies alone, WordPress cannot distinguish between a legitimate administrator action and a forged cross-origin submission. This aligns with the CWE-352 weakness pattern.
Attack Vector
Exploitation occurs over the network and requires user interaction. An attacker hosts a malicious page containing an auto-submitting form or image tag targeting a vulnerable plugin endpoint on the victim's WordPress site. When an authenticated user with sufficient privileges loads that page, the browser attaches valid session cookies and submits the forged request. The plugin processes the action as if the user had initiated it. See the Patchstack Vulnerability Report for additional technical context.
Detection Methods for CVE-2025-62733
Indicators of Compromise
- Unexpected modifications to sidebar configurations in the WordPress administration panel.
- WordPress access log entries showing POST requests to plugin endpoints with Referer headers pointing to external, untrusted origins.
- Administrator sessions issuing plugin requests shortly after visiting external links or opening email content.
Detection Strategies
- Monitor web server logs for state-changing HTTP requests to custom-sidebars-by-proteusthemes endpoints that lack a valid _wpnonce parameter.
- Compare Origin and Referer headers on plugin administrative requests against the site's canonical hostname.
- Audit WordPress wp_options and plugin-managed database rows for unauthorized configuration changes.
Monitoring Recommendations
- Enable verbose access logging on wp-admin endpoints and forward events to a centralized log platform.
- Alert on plugin administration requests originating from cross-origin referers or unusual user-agent strings.
- Track WordPress activity through an audit-log plugin to capture the user, timestamp, and source IP for every plugin configuration change.
How to Mitigate CVE-2025-62733
Immediate Actions Required
- Identify all WordPress sites running Custom Sidebars by ProteusThemes version 1.0.3 or earlier and inventory affected hosts.
- Deactivate the plugin until a patched version is available, given that no fixed release is listed at time of publication.
- Restrict WordPress administrative access to trusted IP ranges and require administrators to log out of wp-admin sessions before browsing untrusted sites.
Patch Information
No patched version is listed in the NVD entry for CVE-2025-62733. The advisory identifies all versions up to and including 1.0.3 as vulnerable. Review the Patchstack Vulnerability Report for the latest remediation status and monitor the vendor for a security release.
Workarounds
- Deploy a web application firewall rule that enforces same-origin Referer and Origin header validation on WordPress administrative POST requests.
- Require administrators to use a dedicated browser profile for WordPress management to reduce exposure to cross-site attacks.
- Enforce least privilege by removing unused administrator accounts and downgrading roles where full administrative access is not required.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
