CVE-2026-32825: dataCycle Auth Bypass Vulnerability

CVE-2026-32825 Overview

CVE-2026-32825 affects dataCycle-CORE, the core processing and framework module of the dataCycle data management system. Versions up to and including 25.07.3 accept unlimited password guesses against both the browser login flow and the JSON login endpoint. The application enables Devise's :lockable module on the user model but explicitly disables both lock and unlock strategies. No request throttling or rate-limiting layer exists in the Rails code. This allows attackers to conduct sustained online password-guessing attacks against valid accounts without triggering lockout. The issue is tracked as CWE-307: Improper Restriction of Excessive Authentication Attempts. It is patched in version 26.06.08.

Critical Impact
Attackers can execute unlimited credential-guessing attempts against /users/sign_in and /api/v4/auth/login, yielding session cookies or JWTs on success.

Affected Products

dataCycle-CORE versions up to and including 25.07.3
Browser login endpoint /users/sign_in
JSON API login endpoint /api/v4/auth/login

Discovery Timeline

2026-07-20 - CVE-2026-32825 published to NVD
2026-07-21 - Last updated in NVD database

Technical Details for CVE-2026-32825

Vulnerability Analysis

The vulnerability stems from a configuration gap in the Devise authentication stack used by dataCycle-CORE. Devise ships a :lockable module that can automatically lock accounts after repeated failed logins. The dataCycle-CORE user model loads :lockable but disables both the lock and unlock strategies. No middleware such as Rack::Attack or another throttling layer enforces limits at the request boundary. As a result, both authentication surfaces process failed credential attempts without penalty. Valid account enumeration combined with continuous guessing can lead to account takeover. Successful authentication returns a standard session cookie on the HTML flow or a fresh JSON Web Token (JWT) on the API flow.

Root Cause

The root cause is missing enforcement of authentication attempt limits [CWE-307]. Devise's :lockable module is loaded but rendered inert by disabled lock and unlock strategies. No compensating control exists at the Rails application, middleware, or reverse-proxy layer within the shipped code.

Attack Vector

An attacker sends repeated login requests to /users/sign_in or /api/v4/auth/login against known or enumerated usernames. The API endpoint is particularly suitable for automation because it does not require a Cross-Site Request Forgery (CSRF) token. On success, the attacker obtains a valid session cookie or JWT and can access the authenticated user's data and privileges. Refer to the GitHub Security Advisory GHSA-736f-cqq3-ccgf for full technical detail.

Detection Methods for CVE-2026-32825

Indicators of Compromise

High volumes of POST requests to /users/sign_in or /api/v4/auth/login from a single source or distributed set of sources
Repeated HTTP 401 or Devise Invalid Email or password responses followed by a successful 200/302 for the same account
New JWT issuance events for accounts from unusual IP addresses or geolocations
Session cookies established shortly after bursts of failed authentication attempts

Detection Strategies

Correlate authentication failure rates per account and per source IP over sliding time windows to identify brute-force patterns
Alert when a single account experiences more than a defined threshold of failed logins within a short interval
Monitor the API login endpoint separately from the browser flow, since automated tooling typically favors the JSON path

Monitoring Recommendations

Enable verbose Rails and reverse-proxy access logging for both login endpoints and forward events to a centralized analytics platform
Track baseline login volumes per endpoint and account, then alert on statistically significant deviations
Review JWT issuance logs for tokens tied to accounts that recently exhibited elevated failure rates

How to Mitigate CVE-2026-32825

Immediate Actions Required

Upgrade dataCycle-CORE to version 26.06.08 or later
Enforce a Web Application Firewall (WAF) or reverse-proxy rate limit on /users/sign_in and /api/v4/auth/login until the upgrade is completed
Require multi-factor authentication (MFA) for privileged accounts where supported by the deployment
Reset credentials for any account showing anomalous authentication activity

Patch Information

The maintainers patched the vulnerability in dataCycle-CORE version 26.06.08. Deployment details and the fix commit references are documented in the GitHub Security Advisory. Operators should upgrade to this release or a later version.

Workarounds

Deploy Rack::Attack or an equivalent Rack middleware to throttle login attempts per IP and per account
Configure the upstream reverse proxy such as NGINX or HAProxy to rate-limit POST requests to both authentication endpoints
Re-enable Devise :lockable lock and unlock strategies in the user model configuration to activate temporary account lockouts

bash

# Configuration example
# Update the dataCycle-CORE gem to the patched release
bundle update datacycle-core --version '>= 26.06.08'

# Optional NGINX limit_req example for the login endpoints
# http { limit_req_zone $binary_remote_addr zone=login:10m rate=5r/m; }
# location = /users/sign_in { limit_req zone=login burst=5 nodelay; }
# location = /api/v4/auth/login { limit_req zone=login burst=5 nodelay; }