CVE-2026-57408: Peach Payments Gateway Auth Bypass Flaw

CVE-2026-57408 Overview

CVE-2026-57408 is a Missing Authorization vulnerability [CWE-862] in the Peach Payments Gateway WordPress plugin (wc-peach-payments-gateway) developed by peachpayments. The flaw affects all versions up to and including 4.0.2. The issue stems from incorrectly configured access control security levels, permitting unauthenticated attackers to reach functionality that should be restricted to authorized users. Successful exploitation impacts integrity and availability of the affected WooCommerce payment workflow.

Critical Impact
An unauthenticated remote attacker can invoke protected plugin functions over the network without user interaction, leading to limited integrity and availability impact on the affected WordPress store.

Affected Products

Peach Payments Gateway WordPress plugin (wc-peach-payments-gateway)
All versions from n/a through <= 4.0.2
WooCommerce sites using peachpayments integration

Discovery Timeline

2026-07-13 - CVE-2026-57408 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-57408

Vulnerability Analysis

The vulnerability is a broken access control issue in the Peach Payments Gateway plugin for WordPress and WooCommerce. Missing Authorization [CWE-862] occurs when the plugin exposes actions or endpoints without verifying that the requesting user holds the required capability or role. An unauthenticated attacker can send crafted HTTP requests to trigger plugin functionality that should require privileged context.

The attack is remotely exploitable, requires low complexity, and needs no privileges or user interaction. The impact is scoped to limited integrity and availability degradation, with no direct confidentiality loss. There is currently no evidence of exploitation in the wild, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.

Root Cause

The root cause is the absence of capability or nonce checks on one or more plugin handlers. WordPress plugins must gate privileged actions using functions such as current_user_can() and validate request authenticity with check_admin_referer() or wp_verify_nonce(). When these controls are missing, any network client can invoke the underlying logic.

Attack Vector

An attacker sends unauthenticated HTTP requests to a vulnerable WordPress site running the Peach Payments Gateway plugin. Because the vulnerable action lacks authorization enforcement, the request is processed as if it originated from an authorized user. This can be used to alter payment-related plugin state or disrupt normal operation of the checkout process.

No verified proof-of-concept code is publicly available. Refer to the Patchstack Vulnerability Advisory for advisory-level technical details.

Detection Methods for CVE-2026-57408

Indicators of Compromise

Unauthenticated POST or GET requests to Peach Payments Gateway plugin endpoints, including admin-ajax.php actions or REST routes registered by wc-peach-payments-gateway
Unexpected changes to WooCommerce order or payment gateway configuration without a corresponding authenticated administrator session
Requests to plugin handlers originating from anomalous IPs or user agents that bypass the WordPress login flow

Detection Strategies

Audit web server access logs for requests targeting plugin-specific query parameters or action= values associated with wc-peach-payments-gateway
Correlate anonymous requests to plugin endpoints with subsequent modifications in the WordPress wp_options or WooCommerce order tables
Deploy a Web Application Firewall (WAF) rule set that flags requests to plugin actions lacking a valid nonce

Monitoring Recommendations

Enable WordPress audit logging to record administrative actions and correlate them against authenticated sessions
Monitor outbound traffic from the WooCommerce host to detect abnormal payment gateway callbacks
Alert on repeated 200-status responses to unauthenticated requests hitting plugin endpoints, which may indicate probing

How to Mitigate CVE-2026-57408

Immediate Actions Required

Identify all WordPress installations running the Peach Payments Gateway plugin at version 4.0.2 or earlier
Update the plugin to a patched version once released by peachpayments, per the Patchstack advisory
Restrict access to wp-admin and admin-ajax.php at the network layer where feasible

Patch Information

Refer to the Patchstack Vulnerability Advisory for the latest patch status. Administrators should upgrade to any version above 4.0.2 that addresses the missing authorization check.

Workarounds

Deploy WAF rules that block unauthenticated requests to Peach Payments Gateway plugin endpoints until a patch is applied
Temporarily deactivate the wc-peach-payments-gateway plugin if payment processing can be routed through an alternate gateway
Enforce IP allowlisting on WordPress administrative and AJAX endpoints to reduce exposure to unauthenticated network attackers

bash

# Example WAF rule (ModSecurity) to block unauthenticated access to plugin actions
SecRule REQUEST_URI "@rx /wp-admin/admin-ajax\.php" \
    "chain,deny,status:403,id:1026057408,msg:'Block unauth Peach Payments Gateway action'"
    SecRule ARGS:action "@rx ^peach_payments_" \
        "chain"
        SecRule &REQUEST_COOKIES:/wordpress_logged_in_/ "@eq 0"