Release History

Progress® Telerik® Report Server 2026 Q1 (12.0.26.402)

April 2, 2026

Explicit control over Table of Contents levels for report items

NEW

• Report authors can now explicitly specify the level at which sections, groups, and items appear in the Table of Contents, instead of relying solely on the report hierarchy. This provides greater control over TOC structure and enables consistent, meaningful outlines across reports and report books.

Secure connectivity between Standalone Report Designer for .NET and Report Server for .NET

NEW

• The Standalone Report Designer for .NET can now securely connect to Report Server for .NET using token‑based authentication. This enables report authors to open, edit, and publish reports directly to the server.

User permissions now allow more granular control over report access

NEW

• We’ve enhanced the report access security by introducing a new permission rule, “Allow Reading Nested Reports,” which controls whether users can read reports embedded as sub-reports or included in a Report Book.

What's Improved

NEW

• ObjectDataSource now supports async methods returning Task and ValueTask.
• The ReportProcessor class now exposes a method to list available rendering extensions.

What's Changed

CHANGED

• The permissions for reading reports are now applied to reports, embedded as sub-reports or included in a Report Book.

Web Designer

FIXED

• GetDesignerResource endpoint fails for requests with different letter casing.

Rendering

FIXED

• "Missing license" message is not displayed correctly in exported CSV and Excel files.

PDF Rendering

FIXED

• SVG polylines with dashed or thick strokes are rendered incorrectly in PDF export using GDI graphics engine.

Report Server .NET

FIXED

• Disabling the last enabled user is allowed.
• The SQL Data Source wizard fails to execute queries with parameters.

Preview

FIXED

• Localization does not work for the Angular and React Report Viewer wrappers.