CVE-2026-72588— bluewave-labs Checkmate - User Enumeration via Differential HTTP Response in Password Recovery
Quick assessment
Affected
bluewave-labs Checkmate
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
BlueWave Labs Checkmate是BlueWave Labs组织的一款监控与运维管理工具。 BlueWave Labs Checkmate 2.1.0及之前版本存在侧信道信息泄露漏洞，该漏洞源于/api/v1/auth/recovery/request端点对已注册邮箱返回HTTP 200，未注册邮箱返回不同状态码，可能导致未经身份验证的远程攻击者确定邮箱是否注册并枚举有效用户账户。
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| bluewave-labs | Checkmate | ≤ 2.1.0 |
affected |
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I. Basic Information for CVE-2026-72588
Vulnerability Information
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Vulnerability Title
bluewave-labs Checkmate - User Enumeration via Differential HTTP Response in Password Recovery
Source: CVE Program / CVE List V5
Vulnerability Description
A user enumeration vulnerability in bluewave-labs/Checkmate through 2.1.0 allows an unauthenticated remote attacker to determine whether a given email address is registered. The POST /api/v1/auth/recovery/request endpoint returns HTTP 200 for registered email addresses and a different status code for unregistered ones, enabling attackers to enumerate valid user accounts.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
响应差异性信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
BlueWave Labs Checkmate 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
BlueWave Labs Checkmate是BlueWave Labs组织的一款监控与运维管理工具。 BlueWave Labs Checkmate 2.1.0及之前版本存在侧信道信息泄露漏洞，该漏洞源于/api/v1/auth/recovery/request端点对已注册邮箱返回HTTP 200，未注册邮箱返回不同状态码，可能导致未经身份验证的远程攻击者确定邮箱是否注册并枚举有效用户账户。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| bluewave-labs | Checkmate | 0 ~ 2.1.0 | - |
|
II. Public POCs for CVE-2026-72588
| # | POC Description | Source Link | Shenlong Link |
|---|
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IV. Related Vulnerabilities
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CVE-2026-85390
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CVE-2026-31836
Mass Assignment Privilege Escalation in Checkmate
Same vendor: bluewave-labs
-
CVE-2026-85390
Checkmate through 3.11.0 Missing Authorization on Maintenanc -
CVE-2026-71862
Checkmate: Sensitive Bearer Token Exposure via Public Status -
CVE-2026-70656
Checkmate: Regular Expression Denial of Service (ReDoS) via -
CVE-2026-55241
Checkmate: Pre-auth Denial of Service via File Upload on Reg -
CVE-2026-31836
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Same weakness: CWE-204
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V. Comments for CVE-2026-72588
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