CVE-2025-12276: Learnhouse Information Disclosure Flaw

CVE-2025-12276 Overview

CVE-2025-12276 is an information disclosure vulnerability in the LearnHouse learning management platform. The flaw resides in the Image Handler component and allows remote attackers to obtain sensitive information through manipulation of unspecified functionality. The issue affects LearnHouse builds up to commit 98dfad76aad70711a8113f6c1fdabfccf10509ca. Because LearnHouse follows a rolling release model, no fixed version identifier is available. The vendor was contacted prior to public disclosure but did not respond. A public exploit reference exists, raising the likelihood of opportunistic abuse against exposed deployments.

Critical Impact
Authenticated remote attackers can disclose sensitive information through the LearnHouse Image Handler component without user interaction.

Affected Products

LearnHouse rolling release up to commit 98dfad76aad70711a8113f6c1fdabfccf10509ca
LearnHouse Image Handler component
All LearnHouse deployments exposing the Image Handler endpoint to network access

Discovery Timeline

2025-10-27 - CVE-2025-12276 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2025-12276

Vulnerability Analysis

The vulnerability is classified under [CWE-200] Exposure of Sensitive Information to an Unauthorized Actor. The defect resides in an unspecified function within the LearnHouse Image Handler. An attacker with low privileges and network access can manipulate input to the handler and trigger disclosure of information that should remain restricted. No user interaction is required. The attack surface is reachable over the network, making remote exploitation straightforward against internet-facing LearnHouse instances. Public proof-of-concept material has been referenced through a GitHub Gist and the VulDB submission tracking this issue.

Root Cause

The root cause is insufficient access control or output filtering within the Image Handler logic. The component returns or exposes data that lies outside the authorization context of the requesting user. Because LearnHouse uses rolling releases, no semantic version delineates vulnerable from fixed code. Operators must track the upstream Git history and confirm whether commits after 98dfad76aad70711a8113f6c1fdabfccf10509ca address the handler.

Attack Vector

Exploitation requires network access to a LearnHouse instance and a valid low-privileged account. The attacker issues crafted requests to the Image Handler endpoint to coerce disclosure of restricted resources. The vulnerability does not require user interaction, elevated privileges beyond a standard authenticated session, or local access. The published exploit reference lowers the barrier for adversaries to weaponize the issue.

No verified exploit code is available. See the GitHub Gist reference and VulDB entry 329947 for technical details.

Detection Methods for CVE-2025-12276

Indicators of Compromise

Unusual volume of requests to LearnHouse Image Handler endpoints from a single authenticated session
Image Handler responses returning unexpected content types or larger-than-expected payloads
Authenticated low-privilege accounts accessing image resources outside their course or organization scope

Detection Strategies

Enable verbose application logging for the Image Handler component and capture request URIs, authenticated user identifiers, and response sizes
Correlate access patterns against role-based access expectations to surface horizontal access anomalies
Inspect web server logs for sequential or enumerated identifiers in image requests originating from the same session

Monitoring Recommendations

Forward LearnHouse application and reverse proxy logs to a centralized SIEM for retention and correlation
Alert on authenticated users issuing high-rate requests to media or image endpoints
Monitor egress traffic from LearnHouse servers for atypical data volumes that may indicate bulk extraction

How to Mitigate CVE-2025-12276

Immediate Actions Required

Restrict network exposure of LearnHouse instances to trusted networks or VPN access while a vendor response is pending
Audit existing user accounts and remove unused or low-trust accounts that could be leveraged for authenticated exploitation
Review LearnHouse access logs for prior abuse of the Image Handler endpoint

Patch Information

No vendor patch or advisory has been published. The vendor was contacted prior to disclosure but did not respond. Administrators should monitor the LearnHouse upstream repository and the VulDB record 329947 for updates. Because LearnHouse uses a rolling release model, fixes will appear as repository commits rather than tagged versions.

Workarounds

Place a reverse proxy or web application firewall in front of LearnHouse and apply rate limits to image endpoints
Enforce strict authentication on all Image Handler routes and disable anonymous or guest access where feasible
Apply network segmentation so the LearnHouse instance cannot be reached by untrusted networks
Implement custom authorization checks at the proxy layer to validate that requested image identifiers belong to the requesting user's scope

bash

# Example nginx configuration to rate-limit and restrict Image Handler access
limit_req_zone $binary_remote_addr zone=img_limit:10m rate=10r/m;

location /api/images/ {
    limit_req zone=img_limit burst=5 nodelay;
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://learnhouse_backend;
}