Progress Software Kemp LoadMaster access Missing Authorization Privilege Escalation Vulnerability

July 29th, 2026
ZDI-26-481 ZDI-CAN-30735

CVE ID

CVE-2026-59690

CVSS Score

8.8 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Progress Software

Affected Products

Kemp LoadMaster

Vulnerability Details

This vulnerability allows remote attackers to escalate privileges on affected installations of Progress Software Kemp LoadMaster. Authentication is required to exploit this vulnerability.

The specific flaw exists within the access API endpoint. The issue results from the lack of authorization prior to allowing access to functionality. An attacker can leverage this vulnerability to escalate privileges to resources normally protected from the user.

Additional Details

Progress Software has issued an update to correct this vulnerability. More details can be found at:
https://community.progress.com/s/article/LoadMaster-Critical-Security-Bulletin-July-2026-CVE-2026-59686-CVE-2026-59687-CVE-2026-59688-CVE-2026-59689-CVE-2026-59690

Disclosure Timeline

  • 2026-06-15 - Vulnerability reported to vendor
  • 2026-07-29 - Coordinated public release of advisory
  • 2026-07-29 - Advisory Updated

Credit

Xander Mackenzie | @thetrueartist.co.uk

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