# CVE-2026-51923: docuForm FSM Server IDOR in user management

Source: https://junglewise.ai/threats/cve-2026-51923-docuform-fsm-server-idor-in-user-management  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-09. Updated: 2026-07-09  
License: CC BY 4.0 with a link back

CVE-2026-51923 · Severity: info · CVSS 8.1 · Published 2026-07-09

A security vulnerability exists in docuForm FSM Server, a document and print process management solution. An attacker with a standard user account can exploit this flaw to access or modify sensitive information belonging to other users. This could lead to a full account takeover, compromising the privacy and integrity of document workflows.

Technologies: [docuForm FSM Server](https://junglewise.ai/threats/technologies/fsm-server). Vendors: [docuForm](https://junglewise.ai/threats/vendors/docuform).

## Quick answers

**Is CVE-2026-51923 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51923 being exploited in the wild.

**How severe is CVE-2026-51923?** Informational severity, with a CVSS score of 8.1, published 9 July 2026.

**Which products and versions are affected?** docuForm FSM Server 11.11c.

**Is there a fix for CVE-2026-51923?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-51923 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-51923?** Check whether you run docuForm FSM Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An Insecure Direct Object Reference (IDOR) vulnerability (CWE-639) exists in the user management functionality of docuForm FSM Server v.11.11c. The application fails to properly validate authorization when a user-controlled key is used to access account settings or data. A remote, authenticated attacker can exploit this by manipulating identifiers in requests to view or modify sensitive information belonging to other users. This can result in unauthorized data disclosure or full account takeover. While the NVD summary mentions arbitrary code execution, the primary researcher's technical documentation (ZeroBreach) classifies this specific CVE as an IDOR leading to account takeover, with a CVSS 3.1 score of 8.1.

## Affected products

- docuForm GmbH FSM Server 11.11c

## Timeline

- 2026-07-01: disclosed: Vulnerability details published by researcher ZeroBreach-GmbH
- 2026-07-09: advisory: CVE published in the National Vulnerability Database (NVD)

## References

- [https://zerobreach.de/](https://zerobreach.de/)
- [https://docuform.de/](https://docuform.de/)
- [https://gist.github.com/ZeroBreach-GmbH](https://gist.github.com/ZeroBreach-GmbH)

## Related threats

- [docuForm FSM user enumeration in login.php](https://junglewise.ai/threats/cve-2026-51926-docuform-fsm-user-enumeration-in-login-php)
- [docuForm FSM Server Local File Inclusion in dfm-menu_report.php](https://junglewise.ai/threats/cve-2026-51925-docuform-fsm-server-local-file-inclusion-in-dfm-menu-report-php)