CVE-2026-13348: Authentication Bypass Vulnerability

CVE-2026-13348 Overview

CVE-2026-13348 is an Improper Restriction of Excessive Authentication Attempts vulnerability [CWE-307] disclosed in a Schneider Electric product. The flaw allows an attacker to perform an unlimited number of authentication attempts against a targeted user account when redirect handling is disabled. Without rate limiting or lockout enforcement, an attacker can conduct brute-force or credential-stuffing attacks over the network. Successful exploitation leads to unauthorized access to the associated user account.

Critical Impact
A network-based attacker with no prior privileges can brute-force user credentials and gain unauthorized account access when redirect handling is disabled.

Affected Products

Schneider Electric product(s) referenced in advisory SEVD-2026-223-01
Specific affected models and versions are enumerated in the vendor advisory
Refer to the Schneider Electric Security Notice SEVD-2026-223-01 for the authoritative product list

Discovery Timeline

2026-09-01 - CVE-2026-13348 published to NVD
2026-09-01 - Last updated in NVD database

Technical Details for CVE-2026-13348

Vulnerability Analysis

The vulnerability is classified as Improper Restriction of Excessive Authentication Attempts [CWE-307]. The authentication component fails to enforce rate limiting, account lockout, or exponential backoff after repeated failed login attempts. The condition is triggered when redirect handling is disabled on the client side, allowing an attacker to submit authentication requests continuously without triggering protective controls.

Because the attack targets an authentication endpoint reachable over the network and requires no user interaction or prior privileges, automated tooling can iterate through large credential lists efficiently. An attacker who obtains valid credentials gains access at the level of the compromised account.

Root Cause

The root cause is missing or bypassable throttling logic on the authentication path. When redirect handling is disabled, the server continues to accept and process login attempts without incrementing failure counters, invoking lockout policies, or returning terminal error states that would deter automated attackers.

Attack Vector

The attack vector is network-based. An attacker sends repeated authentication requests to the target endpoint with redirect handling disabled in the client. Standard brute-force and credential-stuffing tooling can be configured to omit redirect following, bypassing controls tied to redirect responses. No user interaction is required.

Code examples are not published for this issue. Refer to the Schneider Electric Security Notice SEVD-2026-223-01 for vendor-supplied technical detail.

Detection Methods for CVE-2026-13348

Indicators of Compromise

High volumes of failed authentication events for a single account or from a single source address within a short interval
Authentication requests with non-standard HTTP client behavior, such as clients that never follow HTTP 3xx responses
Successful logins immediately preceded by large bursts of failed attempts against the same account

Detection Strategies

Correlate authentication logs to identify brute-force patterns, including distributed attempts across multiple source IPs targeting the same account
Alert on authentication sessions where the client consistently ignores redirect responses during login flows
Baseline normal login failure rates per account and per source, then alert on statistical deviations

Monitoring Recommendations

Ingest authentication logs from the affected Schneider Electric product into a central logging or SIEM platform for correlation
Track failed-to-successful login ratios per account and flag anomalies
Monitor network traffic to management interfaces for repetitive POST requests to login endpoints

How to Mitigate CVE-2026-13348

Immediate Actions Required

Apply the remediation or mitigation guidance published in Schneider Electric Security Notice SEVD-2026-223-01
Restrict network access to authentication endpoints to trusted management networks only
Enforce strong, unique passwords and enable multi-factor authentication where the product supports it

Patch Information

Consult the Schneider Electric Security Notice SEVD-2026-223-01 for fixed versions, patch availability, and vendor-recommended remediation steps for each affected product.

Workarounds

Place affected devices behind a firewall or VPN and block direct exposure of authentication interfaces to untrusted networks
Deploy a reverse proxy or web application firewall that enforces authentication rate limiting and account lockout independent of the backend
Rotate credentials for any account showing evidence of repeated failed authentication attempts

bash

# Configuration example
# Refer to Schneider Electric advisory SEVD-2026-223-01 for vendor-specific configuration guidance