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Privilege escalation in Telerik Report Server service-agent hub

Priority LOW 30CWE-266Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-266.

Summary

Progress Telerik Report Server before 12.2.26.1007 is affected. Incorrect privilege assignment (CWE-266) in the service-agent SignalR hub lets an authenticated user, including a guest with a valid bearer token, register as a trusted service agent. The rogue agent then receives storage settings and encryption private keys during the next settings sync, exposing stored data-source credentials and connection strings.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

In Progress® Telerik® Report Server prior to version 12.2.26.1007, incorrect privilege assignment in the service-agent SignalR hub allows an authenticated user, including a low-privilege or guest account with a valid bearer token, to register as a trusted service agent. On the next server settings-synchronization event, the rogue agent receives storage settings and encryption private keys. This privilege escalation enables disclosure of protected secrets, including stored data-source credentials and connection strings, and allows agent impersonation and interference with task dispatch.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00145 3rd percentileScored 2026-11-07
Fix Fixed Telerik Report Server (Progress Software): 12.2.26.1007

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ProgressTelerik Report Serverbefore 12.2.26.100712.2.26.1007Patch availableCNA
  • Telerik Report Server VendorProgress Affected before 12.2.26.1007 Fixed in 12.2.26.1007 Patch available CNA

Remediation

Upgrade Progress Telerik Report Server to version 12.2.26.1007 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA Telerik Report Server (Progress Software) Fixed in 12.2.26.1007

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Progress Software Telerik Report Server 12.2.26.1007

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-69870 Stored cross-site scripting in Telerik Report Server web report viewersPriority MEDIUM 40

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-106145
  2. 2026-10-09 Alias added: GHSA-mqv8-78j6-26gw
  3. 2026-10-10 CISA SSVC decision points changed
  4. 2026-10-10 Priority changed: MEDIUM → LOW

References

  • TI-2026-07083 Command injection in Progress LoadMaster KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-06182 WhatsUp Gold HasErrors SQL Injection Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-04541 WhatsUp Gold GetFileWithoutZip Directory Traversal Remote Code Execution Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-04060 Registration Authentication Bypass Vulnerability KEVCVSS 3.1CRITICAL 9.8
  • TI-2024-01127 LoadMaster Pre-Authenticated OS Command Injection KEVCVSS 3.1CRITICAL 10.0
  • TI-2023-20934 WS_FTP Server Ad Hoc Transfer Module .NET Deserialization Vulnerability KEVCVSS 3.1CRITICAL 10.0
See all 436 →

Sources