bluewave-labs Checkmate - User Enumeration via Differential HTTP Response in Password Recovery
Priority LOW 30CWE-204Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-204.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0042 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| bluewave-labs | Checkmate | up to 2.1.0 | — | No fix listed | CNA |
- Checkmate Vendorbluewave-labs Affected up to 2.1.0 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-72588
- 2026-10-03 Alias added: GHSA-cjr5-m69m-f39c
References
Advisory 1
More bluewave-labs vulnerabilities
- TI-2026-39916 Checkmate: Pre-auth Denial of Service via File Upload on Registration CVSS 3.1HIGH 7.5
- TI-2026-24389 Mass Assignment Privilege Escalation in Checkmate CVSS 3.1HIGH 8.1
- TI-2026-58598 Checkmate through 3.11.0 Missing Authorization on Maintenance Window, Notification, and Check Deletion Routes CVSS 4.0HIGH 7.1
- TI-2026-23658 Checkmate: Unauthenticated Access to Unpublished Status Page CVSS 3.1MEDIUM 5.3
- TI-2026-49357 Checkmate: Regular Expression Denial of Service (ReDoS) via User-Controlled Regex in Monitor Advanced Matching CVSS 3.1MEDIUM 4.9
- TI-2026-50184 Checkmate: Sensitive Bearer Token Exposure via Public Status Pages When showURL Setting is Enabled CVSS 3.1HIGH 7.5
Sources
- CVE-2026-72588 · CVE Program
- CVE-2026-72588 · NVD
- FIRST EPSS
- GHSA-cjr5-m69m-f39c · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences