CVE-2025-59843— FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
Quick assessment
Affected
FlagForgeCTF flagForge
Exploitation
Public or AI PoC available; prioritize validation
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 2.0.0版本至2.3.1之前版本存在安全漏洞，该漏洞源于公开端点/api/user/[username]返回用户电子邮件地址，可能导致信息泄露。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2025-59843
Vulnerability Information
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Vulnerability Title
FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
Source: CVE Program / CVE List V5
Vulnerability Description
Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.2, the public endpoint /api/user/[username] returns user email addresses in its JSON response. The fix, intended for release in 2.3.1 but only available starting in version 2.3.2, removes email addresses from public API responses while keeping the endpoint publicly accessible. Users should upgrade to version 2.3.2 or later to eliminate exposure. There are no workarounds for this vulnerability.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
侵犯隐私
Source: CVE Program / CVE List V5
Vulnerability Title
Flag Forge 安全漏洞
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 2.0.0版本至2.3.1之前版本存在安全漏洞，该漏洞源于公开端点/api/user/[username]返回用户电子邮件地址，可能导致信息泄露。
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 | >= 2.0.0, < 2.3.2 | - |
|
II. Public POCs for CVE-2025-59843
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | CVE on FlagForge on versions 2.0.0 to 2.3.0. Upgrade to version 2.3.1 to fix the issue. | https://github.com/At0mXploit/CVE-2025-59843-CVE-2025-59932 | POC Details |
AI-Generated POC
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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-2025-59841
FlagForgeCTF's Improper Session Handling Allows Access After -
CVE-2025-59833
FlagForgeCTF Hint Exposure via API
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-2025-59841
FlagForgeCTF's Improper Session Handling Allows Access After -
CVE-2025-59833
FlagForgeCTF Hint Exposure via API
Same weakness: CWE-359
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Netcore NR255-V 1.5.130703 Cross-User Session Disclosure via -
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V. Comments for CVE-2025-59843
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