PT-2025-39658 · Flagforge · Flagforge

At0Mxploit · Published 2025-09-26 · Updated 2026-01-29 · CVE-2025-59843

Positive Technologies (AI Summary)

CVSS v4.0

6.9

Medium

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions Flag Forge versions 2.0.0 through 2.3.0

Description Flag Forge, a Capture The Flag (CTF) platform, has an issue where the public API endpoint /api/user/[username] returns user email addresses in its JSON response. This exposes sensitive user information. The issue is addressed in version 2.3.1, which removes email addresses from public API responses while maintaining the endpoint's public accessibility. The vulnerable parameter is username.

Recommendations Upgrade to Flag Forge version 2.3.1 or later.

Exploit

Fix

Weakness Enumeration

CWE-359

Related Identifiers

CVE-2025-59843

GHSA-QQJV-8R5P-7XPJ

Affected Products

Flagforge

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/59xxx/CVE-2025-59843.json · Exploit
• https://github.com/FlagForgeCTF/flagForge/security/advisories/GHSA-qqjv-8r5p-7xpj · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-59843 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-59843 · Security Note
• https://github.com/FlagForgeCTF/flagForge/releases/tag/v2.3.1 · Note
• https://github.com/FlagForgeCTF/flagForge/commit/1b033f1b6e20fbf6df422d5d1afc9b2347528ace · Note
• https://github.com/FlagForgeCTF/flagForge/compare/v2.3.1...v2.3.2 · Note
• https://t.me/cveNotify/150220 · Telegram Post
• https://twitter.com/CVEnew/status/1971617100100706594 · Twitter Post
• https://twitter.com/At0mXploit/status/1971838025148825960 · Twitter Post
• https://t.me/cveNotify/137845 · Telegram Post
• https://t.me/CVEtracker/33480 · Telegram Post
• https://twitter.com/VulmonFeeds/status/1971701581671264461 · Twitter Post