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CVE-2025-59841— FlagForgeCTF's Improper Session Handling Allows Access After Logout

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 2.2.0版本至2.3.1之前版本存在代码问题漏洞，该漏洞源于会话失效处理不当，可能导致未经授权的操作。

CVSS 9.8 · Critical EPSS 0.42% · P35
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I. Basic Information for CVE-2025-59841

Vulnerability Information
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Vulnerability Title
FlagForgeCTF's Improper Session Handling Allows Access After Logout
Source: CVE Program / CVE List V5
Vulnerability Description
Flag Forge is a Capture The Flag (CTF) platform. In versions from 2.2.0 to before 2.3.1, the FlagForge web application improperly handles session invalidation. Authenticated users can continue to access protected endpoints, such as /api/profile, even after logging out. CSRF tokens are also still valid post-logout, which can allow unauthorized actions. This issue has been patched in version 2.3.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
会话固定
Source: CVE Program / CVE List V5
Vulnerability Title
Flag Forge 代码问题漏洞
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 2.2.0版本至2.3.1之前版本存在代码问题漏洞，该漏洞源于会话失效处理不当，可能导致未经授权的操作。
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)

Shenlong Deep Dive — AI Deep Analysis

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Affected Products

Vendor Product Affected Versions CPE Subscribe
FlagForgeCTF flagForge >= 2.2.0, < 2.3.1 -

II. Public POCs for CVE-2025-59841

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7395 chars
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2025-59841

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Vendor Advisories for CVE-2025-59841 (1)

IV. Related Vulnerabilities

Same product: flagForge
Same vendor: FlagForgeCTF
Same weakness: CWE-384

V. Comments for CVE-2025-59841

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