CVE-2025-25236: Workspace ONE UEM Disclosure Vulnerability

CVE-2025-25236 Overview

CVE-2025-25236 affects Omnissa Workspace ONE Unified Endpoint Management (UEM). The product returns observable response discrepancies that allow unauthenticated attackers to enumerate sensitive information. Attackers can identify valid tenant IDs and user accounts based on differences in server responses. This enumeration primitive enables follow-on brute-force, password-spraying, and credential-stuffing attacks against valid accounts.

The issue is classified under [CWE-204: Observable Response Discrepancy]. Omnissa disclosed the vulnerability in security advisory OMSA-2025-0005.

Critical Impact
Unauthenticated network attackers can enumerate valid tenant IDs and user accounts in Workspace ONE UEM. The disclosed information provides the targeting data required for large-scale credential-based attacks against enterprise identity infrastructure.

Affected Products

Omnissa Workspace ONE UEM (see Omnissa Security Advisory OMSA-2025-0005 for affected versions)

Discovery Timeline

2025-11-12 - CVE-2025-25236 published to the National Vulnerability Database
2026-06-17 - Last updated in the NVD database

Technical Details for CVE-2025-25236

Vulnerability Analysis

Workspace ONE UEM exposes network-facing endpoints that respond differently depending on whether a submitted tenant identifier or user account exists. An attacker probing these endpoints can distinguish valid identifiers from invalid ones without authentication or user interaction. The confidentiality impact is limited to the disclosed identifiers, but the exposure directly enables targeted authentication attacks.

This class of flaw is commonly referred to as a user or tenant enumeration weakness. It does not itself grant access, but it removes the anonymity that would normally slow password-spraying and credential-stuffing campaigns against unified endpoint management platforms.

Root Cause

The root cause is inconsistent response handling on authentication or lookup endpoints. Response attributes such as HTTP status codes, error messages, response bodies, or timing differ measurably based on the validity of the submitted identifier. [CWE-204] describes exactly this discrepancy, where a product responds to two distinct inputs in a way that reveals information about the underlying state.

Attack Vector

Exploitation requires only network access to the Workspace ONE UEM console or its exposed APIs. An attacker scripts requests containing candidate tenant IDs or usernames and compares responses. Valid identifiers are extracted from the response set and fed into credential-stuffing tooling using previously leaked password corpora. The attack requires no privileges and no user interaction.

See the Omnissa Security Advisory OMSA-2025-0005 for vendor-specific technical details.

Detection Methods for CVE-2025-25236

Indicators of Compromise

High volumes of authentication or tenant-lookup requests from a single source IP or narrow IP range targeting the Workspace ONE UEM console.
Sequential or dictionary-style username submissions to /authentication, /login, or tenant discovery endpoints.
Sudden spikes in HTTP 4xx responses followed by concentrated 200/302 responses against a small subset of accounts.

Detection Strategies

Baseline normal request volumes to Workspace ONE UEM authentication endpoints and alert on statistical deviations.
Correlate enumeration-style traffic patterns with subsequent successful authentication events to detect credential-stuffing follow-on activity.
Inspect web application firewall (WAF) and reverse proxy logs for high-cardinality username or tenant parameter values from single sources.

Monitoring Recommendations

Enable verbose access logging on Workspace ONE UEM front-end infrastructure and forward logs to a central analytics platform.
Monitor for password-spray patterns: many usernames tried against few passwords in short time windows.
Alert on authentication attempts from geographies or ASNs not associated with your workforce.

How to Mitigate CVE-2025-25236

Immediate Actions Required

Apply the patch referenced in Omnissa Security Advisory OMSA-2025-0005 as soon as it is available for your deployment.
Restrict network exposure of the Workspace ONE UEM console to trusted networks or VPN-terminated access where operationally feasible.
Enforce multi-factor authentication (MFA) for all administrative and end-user accounts to blunt credential-stuffing follow-on attacks.

Patch Information

Omnissa has published fixed versions in advisory OMSA-2025-0005. Administrators should review the Omnissa Security Response Overview and the OMSA-2025-0005 advisory to identify the fixed release applicable to their environment and schedule an upgrade.

Workarounds

Place a WAF or reverse proxy in front of Workspace ONE UEM to rate-limit authentication and tenant-lookup requests per source IP.
Configure account lockout and progressive delay policies to slow automated enumeration and credential-stuffing attempts.
Deploy IP allowlisting for administrative console access until the patch is applied.
Enable and monitor authentication anomaly alerts within Workspace ONE UEM and upstream identity providers.

bash

# Example nginx rate-limit snippet for Workspace ONE UEM front-end
# Refer to OMSA-2025-0005 for vendor-specific guidance
limit_req_zone $binary_remote_addr zone=ws1auth:10m rate=10r/m;

server {
    location /authentication/ {
        limit_req zone=ws1auth burst=5 nodelay;
        proxy_pass https://ws1-uem-backend;
    }
}