CVE-2025-31376 Overview
CVE-2025-31376 is a missing authorization vulnerability in the NanoSupport WordPress plugin by Mayeenul Islam. The plugin provides support-ticket functionality for WordPress sites. Versions up to and including 0.6.0 allow authenticated users to exploit incorrectly configured access control checks. The weakness maps to CWE-862: Missing Authorization and permits low-privilege accounts to perform actions that should be restricted to higher-privilege roles.
Critical Impact
Authenticated attackers with low privileges can bypass access control checks in NanoSupport <= 0.6.0, leading to limited integrity impact on support-ticket data.
Affected Products
- Mayeenul Islam NanoSupport plugin for WordPress
- All versions from n/a through <= 0.6.0
- WordPress sites running the vulnerable NanoSupport plugin
Discovery Timeline
- 2025-03-31 - CVE-2025-31376 published to the National Vulnerability Database (NVD)
- 2026-06-17 - Last updated in the NVD database
Technical Details for CVE-2025-31376
Vulnerability Analysis
The vulnerability is a broken access control flaw in the NanoSupport WordPress plugin. NanoSupport exposes plugin actions that do not verify whether the requesting user holds the required capability or role. Any authenticated user can invoke those actions and trigger effects reserved for privileged operators such as support agents or administrators.
An attacker requires only a valid low-privilege account, such as a subscriber, to send the affected requests. No user interaction from another party is needed. The scope is limited to integrity impact on plugin-managed data. Confidentiality and availability are not directly affected, according to the published metrics. See the Patchstack Vulnerability Report for advisory details.
Root Cause
The root cause is missing or incorrect authorization enforcement on plugin request handlers. The affected code paths do not call WordPress capability checks such as current_user_can() before performing sensitive operations. Access control decisions rely on assumptions about who can reach the endpoint rather than explicit permission validation.
Attack Vector
The attack vector is network-based and requires authentication with low privileges. An attacker logs in with any account that has posting or subscription rights, then issues crafted HTTP requests to the vulnerable NanoSupport handlers. Because the plugin does not verify authorization, the requests execute with the caller's session and modify data the caller should not control. No verified proof-of-concept code is publicly available for CVE-2025-31376.
Detection Methods for CVE-2025-31376
Indicators of Compromise
- Unexpected changes to NanoSupport ticket records, statuses, or assignments performed by low-privilege user accounts
- HTTP POST or GET requests to NanoSupport plugin endpoints originating from subscriber-tier accounts
- Anomalous WordPress admin-ajax.php or REST route activity referencing NanoSupport actions outside normal support workflows
Detection Strategies
- Review WordPress access logs for requests to NanoSupport endpoints correlated with non-agent user IDs
- Audit the plugin's request handlers for missing current_user_can() checks and compare against the vendor patch
- Enable WordPress audit logging to capture ticket state transitions and correlate the acting user role with the action performed
Monitoring Recommendations
- Alert on privilege-mismatched actions where a subscriber or contributor role modifies NanoSupport data
- Monitor plugin update status across managed WordPress sites and flag installations still running NanoSupport <= 0.6.0
- Track authenticated request volumes against plugin routes to identify enumeration or automated abuse attempts
How to Mitigate CVE-2025-31376
Immediate Actions Required
- Upgrade NanoSupport to a version later than 0.6.0 once the vendor publishes a fixed release
- Inventory all WordPress sites and identify installations of the NanoSupport plugin at or below version 0.6.0
- Restrict registration of low-privilege accounts on sites that expose NanoSupport until a patch is applied
Patch Information
Refer to the Patchstack Vulnerability Report for the latest fixed-version guidance. At the time of publication, the advisory covers NanoSupport up to and including 0.6.0. Confirm the installed plugin version in the WordPress admin under Plugins > Installed Plugins and apply updates through the WordPress plugin manager.
Workarounds
- Deactivate the NanoSupport plugin until an updated version is installed
- Apply web application firewall (WAF) rules that block requests to NanoSupport endpoints from users below the support-agent role
- Limit new user registrations and require administrator approval for accounts that need support-portal access
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
