CVE-2025-59833— FlagForgeCTF Hint Exposure via API
Quick assessment
Affected
FlagForgeCTF flagForge
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Flag Forge是FlagForge开源的一个易于使用的CTF平台。 Flag Forge 2.1.0版本至2.3.0之前版本存在信息泄露漏洞，该漏洞源于API端点GET /api/problems/:id以明文返回挑战提示，可能导致业务逻辑被破坏。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-59833
Vulnerability Information
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Vulnerability Title
FlagForgeCTF Hint Exposure via API
Source: CVE Program / CVE List V5
Vulnerability Description
Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.1.0 to before 2.3.0, the API endpoint GET /api/problems/:id returns challenge hints in plaintext within the question object, regardless of whether the user has unlocked them via point deduction. Users can view all hints for free, undermining the business logic of the platform and reducing the integrity of the challenge system. This issue has been patched in version 2.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Flag Forge 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Flag Forge是FlagForge开源的一个易于使用的CTF平台。 Flag Forge 2.1.0版本至2.3.0之前版本存在信息泄露漏洞，该漏洞源于API端点GET /api/problems/:id以明文返回挑战提示，可能导致业务逻辑被破坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| FlagForgeCTF | flagForge | >= 2.1.0, < 2.3.0 | - |
|
II. Public POCs for CVE-2025-59833
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
Same product: flagForge
-
CVE-2026-21868
Flag Forge has ReDoS Vulnerability in User Profile Lookup AP -
CVE-2025-61777
FlagForge Allows Unauthenticated Badge Template API Access -
CVE-2025-59932
FlagForgeCTF Unauthenticated Resource Modification/Deletion -
CVE-2025-59843
FlagForgeCTF Exposes User Emails via Public /api/user/[usern -
CVE-2025-59841
FlagForgeCTF's Improper Session Handling Allows Access After
Same vendor: FlagForgeCTF
-
CVE-2026-21868
Flag Forge has ReDoS Vulnerability in User Profile Lookup AP -
CVE-2025-61777
FlagForge Allows Unauthenticated Badge Template API Access -
CVE-2025-59932
FlagForgeCTF Unauthenticated Resource Modification/Deletion -
CVE-2025-59843
FlagForgeCTF Exposes User Emails via Public /api/user/[usern -
CVE-2025-59841
FlagForgeCTF's Improper Session Handling Allows Access After
Same weakness: CWE-200
-
CVE-2026-87426
Brocade ASCG <3.5.0信息泄露漏洞 -
CVE-2026-106561
Backstage: Sensitive information disclosure in Kubernetes re -
CVE-2026-93677
Langflow OSS is affected by multiple vulnerabilities -
CVE-2026-97626
Gitea profile feed disclosure bypassing user visibility -
CVE-2026-106501
Backstage: Sensitive information exposure in Scaffolder
V. Comments for CVE-2025-59833
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