CVE-2025-0739: Thesamur Embedai Auth Bypass Vulnerability

CVE-2025-0739 Overview

CVE-2025-0739 is an Improper Access Control vulnerability [CWE-284] affecting EmbedAI version 2.1 and below from vendor Thesamur. The flaw resides in the /demos/embedai/subscriptions/show/<SUSCBRIPTION_ID> endpoint. An authenticated attacker can manipulate the SUSCBRIPTION_ID path parameter to view subscription information belonging to other users. This is a classic Insecure Direct Object Reference (IDOR) pattern where the application fails to verify object ownership against the authenticated session. The vulnerability affects the confidentiality of user subscription records but does not permit modification or service disruption.

Critical Impact
Authenticated attackers can enumerate and disclose subscription details for arbitrary EmbedAI users by tampering with a single URL path parameter.

Affected Products

Thesamur EmbedAI 2.1 and earlier
Endpoint: /demos/embedai/subscriptions/show/<SUSCBRIPTION_ID>
Component: thesamur:embedai

Discovery Timeline

2025-01-30 - CVE-2025-0739 published to the National Vulnerability Database (NVD)
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-0739

Vulnerability Analysis

EmbedAI exposes a subscription detail endpoint that accepts a subscription identifier as a path parameter. The application authenticates the requesting user but does not enforce an authorization check tying the requested SUSCBRIPTION_ID to the current session principal. As a result, any authenticated user can request another user's subscription record by substituting the identifier value. The disclosed data pertains to subscription metadata, which may include billing status, plan tier, and account linkage. The issue is a horizontal privilege escalation pattern rather than an unauthenticated data exposure, since valid credentials remain a precondition.

Root Cause

The root cause is missing object-level authorization on the subscription retrieval route. The controller reads the identifier directly from the URL and returns the corresponding database record without validating ownership. This is a canonical Insecure Direct Object Reference (IDOR) defect classified under [CWE-284] Improper Access Control. Predictable numeric identifiers compound the impact because attackers can iterate values sequentially to enumerate accounts.

Attack Vector

Exploitation is straightforward. An attacker registers or uses an existing EmbedAI account, authenticates, and issues HTTP GET requests to the vulnerable endpoint while incrementing or brute-forcing values for SUSCBRIPTION_ID. Each successful response returns subscription information for the corresponding user. The attack requires network access to the application and low-privilege authenticated credentials. No user interaction and no elevated privileges are required. Refer to the INCIBE Security Notice for additional technical context.

Detection Methods for CVE-2025-0739

Indicators of Compromise

Repeated authenticated GET requests to /demos/embedai/subscriptions/show/<ID> from a single session with sequential or randomized identifier values.
Unusually high volumes of successful 200 OK responses returned to a single account for subscription resources not associated with that account.
Access patterns where a user views subscription IDs outside a small, expected range.

Detection Strategies

Correlate application access logs against session identity to flag requests where the requested SUSCBRIPTION_ID does not belong to the authenticated user.
Deploy Web Application Firewall (WAF) rules that rate-limit and alert on rapid sequential enumeration of numeric path parameters.
Ingest EmbedAI web server and application logs into a SIEM and build queries for IDOR-style patterns across authenticated endpoints.

Monitoring Recommendations

Alert on anomalous request-rate spikes to the subscriptions endpoint from any single authenticated session.
Monitor for account-enumeration signatures across all resource-lookup endpoints, not just subscriptions.
Retain HTTP access logs long enough to reconstruct historical enumeration attempts if exploitation is suspected.

How to Mitigate CVE-2025-0739

Immediate Actions Required

Upgrade EmbedAI beyond version 2.1 once the vendor publishes a fixed release. Track the INCIBE Security Notice for patch availability.
Review historical access logs for the vulnerable endpoint and notify any users whose subscription records were accessed by other accounts.
Restrict access to the EmbedAI application to trusted networks or authenticated users behind additional access controls until a patch is applied.

Patch Information

At the time of the last NVD update on 2026-06-17, no vendor advisory or patched release URL is enumerated in the CVE record. Administrators should consult the INCIBE Security Notice and the Thesamur EmbedAI project for remediation guidance and version updates.

Workarounds

Place the subscription endpoint behind a reverse proxy that enforces per-user path allow-listing where feasible.
Add a WAF rule to block or rate-limit requests to /demos/embedai/subscriptions/show/* from accounts exceeding a low request threshold.
If source access is available, add server-side authorization checks that validate the session user owns the requested SUSCBRIPTION_ID before returning data.
Replace predictable numeric subscription identifiers with unguessable UUIDs to raise the cost of enumeration while a full authorization fix is developed.

bash

# Example NGINX rate-limit snippet to slow enumeration of the vulnerable endpoint
limit_req_zone $binary_remote_addr zone=embedai_sub:10m rate=5r/m;

location ~ ^/demos/embedai/subscriptions/show/ {
    limit_req zone=embedai_sub burst=3 nodelay;
    proxy_pass http://embedai_backend;
}