Overview
The cybersecurity community has recently identified a significant vulnerability in the Flag Forge Capture The Flag (CTF) platform. This vulnerability, designated as CVE-2025-59826, potentially allows non-admin users to create arbitrary challenges, leading to potential system compromise or data leakage. This issue primarily affects systems running version 2.1.0 of the Flag Forge CTF platform and is of critical concern due to the potential for malicious, incorrect, or misleading content to be introduced.
Vulnerability Summary
CVE ID: CVE-2025-59826
Severity: High (CVSS: 7.6)
Attack Vector: Network
Privileges Required: Low
User Interaction: Required
Impact: Potential system compromise or data leakage
Affected Products
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Product | Affected Versions
Flag Forge | 2.1.0
How the Exploit Works
The vulnerability originates from insufficient access controls in the Flag Forge platform. In version 2.1.0, the software does not adequately restrict the capabilities of non-admin users, allowing them to create arbitrary challenges. An attacker, exploiting this flaw, could potentially create challenges containing malicious or misleading content, leading to a range of damaging scenarios, including system compromise or data leakage.
Conceptual Example Code
The following is a
conceptual
example of how the vulnerability might be exploited. This is a simulated HTTP POST request that a malicious user could potentially send to create a challenge with malicious content:
POST /createChallenge HTTP/1.1
Host: target.example.com
Content-Type: application/json
{
"challenge_name": "Fake Challenge",
"challenge_content": "malicious_script_here"
}In this example, the attacker is creating a challenge named “Fake Challenge” with malicious content embedded. This is a theoretical example and may not be representative of a real-world attack scenario.
Mitigation Guidance
Systems administrators are advised to patch their Flag Forge platform to version 2.2.0 promptly to ensure the vulnerability is adequately addressed. In cases where immediate patching is not feasible, implementing Web Application Firewall (WAF) or Intrusion Detection System (IDS) controls can serve as temporary mitigation measures.
