CVE-2026-42763: SePay Gateway Information Disclosure Flaw

CVE-2026-42763 Overview

CVE-2026-42763 is a missing authorization vulnerability [CWE-862] in the SePay Gateway plugin for WordPress, developed by the SePay team. The flaw affects all versions from initial release through 1.1.20 and allows authenticated users with low privileges to retrieve embedded sensitive data from the plugin. The vulnerability stems from absent authorization checks on endpoints that expose confidential information.

Critical Impact
Authenticated attackers with low-level privileges can retrieve sensitive data from the SePay Gateway plugin over the network, compromising payment-related configuration and integration secrets.

Affected Products

SePay Gateway WordPress plugin versions through 1.1.20
SePay team SePay Gateway (all versions prior to and including 1.1.20)
WordPress installations using the SePay Gateway payment integration

Discovery Timeline

2026-05-25 - CVE CVE-2026-42763 published to NVD
2026-05-26 - Last updated in NVD database

Technical Details for CVE-2026-42763

Vulnerability Analysis

The SePay Gateway plugin exposes functionality that returns embedded sensitive data without verifying whether the requesting user is authorized to access it. The plugin implements authentication checks but omits a corresponding authorization layer. Any authenticated WordPress user, regardless of role, can invoke the affected functionality and retrieve protected data.

The vulnerability is classified under [CWE-862] Missing Authorization. Confidentiality is fully impacted while integrity and availability remain intact. The flaw is exploitable over the network with low attack complexity and requires no user interaction.

Root Cause

The root cause is the absence of a capability or role check on plugin endpoints that return sensitive configuration data. WordPress plugins typically guard privileged operations with current_user_can() checks or nonce validation tied to a capability. SePay Gateway versions up to 1.1.20 rely solely on authentication state, treating all logged-in users as equally trusted.

Attack Vector

An attacker first obtains low-privileged WordPress credentials, such as a subscriber or customer account created through self-registration. The attacker then sends a network request to the vulnerable plugin endpoint. Because the endpoint does not validate the user's role or capabilities, it returns embedded sensitive data, which may include API keys, merchant identifiers, or payment integration secrets.

No proof-of-concept code is publicly verified for this CVE. Refer to the Patchstack Vulnerability Advisory for additional technical context.

Detection Methods for CVE-2026-42763

Indicators of Compromise

Unexpected HTTP requests from low-privileged user sessions to SePay Gateway plugin endpoints under /wp-admin/admin-ajax.php or /wp-json/ routes
Access log entries showing successful responses to plugin actions from subscriber-level accounts
Outbound use of SePay merchant credentials from IP addresses not associated with the legitimate site operator

Detection Strategies

Audit WordPress access logs for requests targeting SePay Gateway endpoints initiated by non-administrative roles
Correlate authenticated session identifiers with the user role at request time and flag low-privileged users accessing payment plugin functions
Compare installed plugin versions across WordPress sites against the patched release to identify exposed instances

Monitoring Recommendations

Enable verbose logging on the SePay Gateway plugin and forward logs to a centralized SIEM for retention and search
Alert on bulk read operations against plugin settings endpoints within short time windows
Track changes to merchant configuration values and rotate credentials if anomalous reads are observed

How to Mitigate CVE-2026-42763

Immediate Actions Required

Update SePay Gateway to a version later than 1.1.20 once the vendor publishes a patched release
Rotate any API keys, merchant tokens, and shared secrets configured within the plugin in case of prior exposure
Restrict WordPress self-registration and audit existing low-privileged accounts for legitimacy

Patch Information

The vulnerability affects SePay Gateway from initial release through 1.1.20. Consult the Patchstack Vulnerability Advisory for vendor patch availability and the fixed version number.

Workarounds

Disable the SePay Gateway plugin on affected WordPress sites until a patched version is deployed
Block access to SePay Gateway plugin endpoints at the web application firewall for requests originating from non-administrative users
Disable WordPress user self-registration via Settings > General to reduce the pool of low-privileged accounts available to attackers

bash

# Disable the plugin via WP-CLI until a patched release is available
wp plugin deactivate sepay-gateway

# Verify deactivation
wp plugin status sepay-gateway