Vulnerability DatabaseCVE-2026-121562
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CVE-2026-121562
Published:November 03, 2026
Updated:November 04, 2026
CTFd 3.1.0 before 3.8.7 contains an information disclosure vulnerability in the /api/v1/teams list endpoint that exposes non-public team custom field values. Unauthenticated attackers can paginate GET requests to collect hidden registration data such as emails, phone numbers, and student IDs when team mode and public visibility are enabled.
Affected Packages
https://github.com/CTFd/CTFd.git (GITHUB):
Affected version(s) >=3.1.0 <3.8.7
Fix Suggestion:
Update to version 3.8.7
Related Resources (9)
https://github.com/CTFd/CTFd
https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/api/v1/teams.py#L128-L131
https://nvd.nist.gov/vuln/detail/CVE-2026-121562
https://www.vulncheck.com/advisories/ctfd-3.1.0-before-3.8.7-information-disclosure-via-api-v1-teams-endpoint
https://blog.ctfd.io/ctfd-3-8-7/
https://github.com/CTFd/CTFd/releases/tag/3.8.7
https://github.com/CTFd/CTFd/commit/122c224030224ca6a04d2928280055a84bbd4850
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/121xxx/CVE-2026-121562.json
https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/schemas/teams.py#L336-L363
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CVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Incorrect Authorization
CWE-863
EPSS
Base Score:
0.33