CVE-2026-121562

CTFd 3.1.0 before 3.8.7 Information Disclosure via /api/v1/teams Endpoint

CVSS score

6.9

EPSS probability

—

Risk score

0.7

Published

4 h ago

Overview Public Exploits (0)Newsroom Vulnerability Timeline

Official patch verified

Etkilenen ürün ve sürüm için yayımlanan güvenlik güncellemesini uygulayın.

Impact on My Inventory

Only the personal products you have added to your account are assessed; an organisation's inventory does not appear here.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CTFd /api/v1/teams Endpoint Information Disclosure Vulnerability

Sources read

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

CTFd versions 3.1.0 through 3.8.6 contain an information disclosure vulnerability in the /api/v1/teams list endpoint. Unauthenticated attackers can collect non-public custom field values when team mode and public visibility are enabled.

Why does it matter?

This vulnerability allows unauthenticated individuals to access hidden registration data such as emails, phone numbers, and student IDs, compromising sensitive user privacy.

What should be done?

Upgrade software to version 3.8.7 or later
Apply the provided patch commit references
Follow vendor advisory guidelines

Chain of evidence and sources2 verified claims

CTFd 3.1.0 ile 3.8.7 arasındaki sürümler /api/v1/teams uç noktasında bilgi ifşası barındırır.

S0 · daybreach-canonical S1 · cvelist

Kimliği doğrulanmayan saldırganlar GET istekleri ile gizli kayıt verilerini toplayabilir.

S0 · daybreach-canonical S1 · cvelist

Show the technical text from the sources

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.

CVSS vector: 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

CWE: CWE-863

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-121562 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

ID	VENDOR	PRODUCT	ACTION
1	CTFd	CTFd	View

Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCORE	VERSION	SEVERITY	VECTOR	SOURCE
6.9	CVSS V4_0	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	CVE CNA
6.9	CVSS V40	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
5.3	CVSS V3_1	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	CVE CNA
5.3	CVSS V31	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	NVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch verified

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

cvelist

Patch Commit

Open source

reference

Patch Commit

Open source

Confirm the affected product and version against the source evidence above.

Restrict access to internet-facing services and apply network segmentation.

Apply the official update named in the evidence only to the matching product and version.

Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121562 is associated with the following CWEs:

CWE-863: Common Weakness Enumeration Entry CWE-863

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121562 weaknesses.

CAPEC-66: SQL Injection CAPEC-126: Path Traversal CAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden

PermissionsGerekmiyor

UserGerekmiyor

Official Sources and Advisories

Patch Commitpatch https://github.com/CTFd/CTFdvendor-advisory https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/api/v1/teams.py#L128-L131vendor-advisory https://github.com/CTFd/CTFd/blob/3.8.6/CTFd/schemas/teams.py#L336-L363vendor-advisory https://blog.ctfd.io/ctfd-3-8-7/vendor-advisory CTFd 3.8.7 Release Notesvendor-advisory VulnCheck Advisory: CTFd 3.1.0 before 3.8.7 Information Disclosure via /api/v1/teams Endpointvendor-advisory

CVSS Vector Radar Chart

6.9 / 10

Vulnerability Scoring Details

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

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone required

User InteractionNone required

Confidentiality (Gizlilik)Low

Integrity (Bütünlük)None

Availability (Erişilebilirlik)None

Yama doğrulandı

2 doğrulanmış yama veya düzeltilmiş sürüm kanıtı bulundu.

Follow the vendor

CTFd

Weakness Type (CWE & CAPEC)

CWE-863

Get this vulnerability through the API

Affected products, version ranges, exploitation status and patch information in a single request, with a free key.

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