Checkmate
CVE-2026-30829
MEDIUM
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection Data exposure prevention
MITRE ATT&CK
2 techniques across 2 tactics: Collection, Discovery The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS 5.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: None. Exploitation no authentication required. Public exploit/POC available. |
| Exploit ScenarioDerived | An attacker without authentication could exploit this vulnerability to compromise the affected system. |
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Alert meAnalysisAIv1 – Mar 12, 2026
Checkmate versions prior to 3.4.0 allow unauthenticated attackers to retrieve unpublished status pages and internal monitoring data through the GET /api/v1/status-page/:url endpoint due to missing authentication checks. Public exploit code exists for this information disclosure vulnerability, enabling remote attackers to access sensitive server hardware, uptime, and incident details without credentials. No patch is currently available for affected deployments.
Earlier versions of this analysis (1)
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. [CVSS 5.3 MEDIUM]
RemediationAI
Fixed in version 3.4.0.. Restrict network access to the affected service where possible.
Affects your stack
Find out whether the stacks and servers you run are on an affected version.
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
Classified as CWE-200 (Information Exposure). Affects Checkmate. Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Prior to version 3.4.0, an unauthenticated information disclosure vulnerability exists in the GET /api/v1/status-page/:url endpoint. The endpoint does not enforce authentication or verify whether a status page is published before returning full status page details. As a result, unpublished status pages and their associated
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- Exploit and PoC references, threat intelligence from 22 sources
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
2DescriptionGitHub Advisory
Checkmate is an open-source, self-hosted tool designed to track and monitor server hardware, uptime, response times, and incidents in real-time with beautiful visualizations. Prior to version 3.4.0, an unauthenticated information disclosure vulnerability exists in the GET /api/v1/status-page/:url endpoint. The endpoint does not enforce authentication or verify whether a status page is published before returning full status page details. As a result, unpublished status pages and their associated internal data are accessible to any unauthenticated user via direct API requests. This issue has been patched in version 3.4.0.
Executive ViewAI
Organizations using real-time with beautiful visualizations. should be aware of moderate risk from CVE-2026-30829, a information exposure vulnerability rated CVSS 5.3. Sensitive information could be exposed to unauthorized parties. Proof-of-concept code is publicly available. Organizations should apply vendor updates when available and monitor for exploitation.
Apply vendor patch. If patching is delayed: restrict endpoint access, redact sensitive data in logs.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.
Affected Products (CPE)GitHub Advisory
A mass assignment vulnerability in Checkmate's user profile update endpoint allows any authenticated user to escalate th
Remote memory exhaustion in Bluewave Labs Checkmate prior to version 3.9.1 allows unauthenticated network attackers to c
Credential leakage in Bluewave Labs Checkmate versions 3.3.0 through 3.9.1 exposes HTTP Authorization secrets to unauthe
Missing role-guard middleware on three API route groups in Checkmate through v3.11.0 allows any authenticated low-privil
User enumeration via observable response discrepancy in Checkmate through version 2.1.0 exposes whether any given email
ReDoS (catastrophic regex backtracking) in Checkmate monitoring platform versions 3.5.1 through 3.9.1 allows an authenti
Exploit-DB