CVE-2026-121562
CTFd 3.1.0 before 3.8.7 Information Disclosure via /api/v1/teams Endpoint
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| CTFd CTFd |
≥ 3.1.0; < 3.8.7 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | CNA: VulnCheck |
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/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 | NVD: [email protected] |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/CTFd/CTFd/commit/122c224030224ca6a04d2928280055a84bbd4850CNA: VulnCheck · patch
- https://github.com/CTFd/CTFdCNA: VulnCheck · product
- https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/api/v1/teams.py#L128-L131CNA: VulnCheck · technical-description
- https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/schemas/teams.py#L336-L363CNA: VulnCheck · technical-description
- https://blog.ctfd.io/ctfd-3-8-7/CNA: VulnCheck · technical-description
- https://github.com/CTFd/CTFd/releases/tag/3.8.7CNA: VulnCheck · technical-description, release-notes
- https://www.vulncheck.com/advisories/ctfd-3.1.0-before-3.8.7-information-disclosure-via-api-v1-teams-endpointCNA: VulnCheck · third-party-advisory
- https://blog.ctfd.io/ctfd-3-8-7/[email protected]
- https://github.com/CTFd/CTFd[email protected]
- https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/api/v1/teams.py#L128-L131[email protected]
- https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/schemas/teams.py#L336-L363[email protected]
- https://github.com/CTFd/CTFd/commit/122c224030224ca6a04d2928280055a84bbd4850[email protected]
- https://github.com/CTFd/CTFd/releases/tag/3.8.7[email protected]
- https://www.vulncheck.com/advisories/ctfd-3.1.0-before-3.8.7-information-disclosure-via-api-v1-teams-endpoint[email protected]
For agents and automation
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Endpoints and access details
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