Account enumeration via distinguishable login responses
Published Jul 9, 2026 · Updated Jul 9, 2026
User enumeration in docuForm GmbH FSM Client 11.11c allows remote attackers to identify valid accounts through the login.php interface. The authentication path returns observably different server responses for valid and invalid usernames instead of normalizing login failures. No authentication is required, and the disclosed account names support later brute-force or credential-stuffing attempts without directly exposing passwords.
Summary
What happened
User enumeration in docuForm GmbH FSM Client 11.11c allows remote attackers to identify valid accounts through the login.php interface. The authentication path returns observably different server responses for valid and invalid usernames instead of normalizing login failures. No authentication is required, and the disclosed account names support later brute-force or credential-stuffing attempts without directly exposing passwords.
The record
- CVE
- CVE-2026-51926
- Published
- Jul 9, 2026
- Updated
- Jul 9, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-203, T1589
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 9, 2026CVE publishedPublication date reported by the CVE source.
- Jul 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
What conditions does exploitation require?
What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo