CVE-2025-59843 FlagForgeCTF Exposes User Emails via Public /api/user/[username] API
Attackers can retrieve user email addresses via a public API endpoint, exposing private user data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-59843?
CVE-2025-59843 is a medium-severity vulnerability in FlagForgeCTF flagForge, published on 26 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-359
Which versions are affected by CVE-2025-59843?
It affects 1 product.
Products include Flagforge Flagforge.
How do I fix CVE-2025-59843?
No fix has been published for CVE-2025-59843 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-59843 being exploited?
There is no known exploitation of CVE-2025-59843 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in FlagForgeCTF flagForge
- CVE-2025-59841 FlagForgeCTF's Improper Session Handling Allows Access After Logout
- CVE-2025-61777 FlagForge Allows Unauthenticated Badge Template API Access
- CVE-2025-59932 FlagForgeCTF Unauthenticated Resource Modification/Deletion
- CVE-2025-59827 FlagForgeCTF is Missing Authorization in main-v2
- CVE-2025-59826 FlagForgeCTF Vulnerable to Unauthorized Problem Creation
Sources
Also known as GHSA-qqjv-8r5p-7xpj.