CVE-2025-59843

Flag Forge is a Capture The Flag (CTF) platform. From versions 2.0.0 to before 2.3.1, the public endpoint /api/user/[username] returns user email addresses in its JSON response. The problem has been patched in FlagForge version 2.3.1. The fix removes email addresses from public API responses while keeping the endpoint publicly accessible. Users should upgrade to version 2.3.1 or later to eliminate exposure. There are no workarounds for this vulnerability.

CVSS v4.0

6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS

0.41% chance of exploitation in the next 30 days, 34th percentile

Published

2025-09-26

Updated

2026-01-28

Proof-of-concept exploits (1)

• At0mXploit/CVE-2025-59843-CVE-2025-599321★ · 2025-09-27

References

• CVE Record
• NVD entry

Related

• CVE-2025-59932
• CVE-2025-59840
• CVE-2025-5985
• CVE-2025-59839
• CVE-2025-59886
• CVE-2025-59836