CVE-2026-93547: Vaadin Spreadsheet missing authorization check in cell comments

CVE-2026-93547 · Severity: info · Published 2026-09-30

The Vaadin Spreadsheet component fails to properly check user permissions when adding or editing cell comments, allowing authenticated users to bypass sheet protection and modify locked cells. An attacker can add, replace, or create comments on protected spreadsheet cells that they should not have access to, potentially creating new rows and cells in the process, which could lead to unauthorized data modification in spreadsheet-based applications.

Technologies: Vaadin. Vendors: Vaadin.

Quick answers

Is CVE-2026-93547 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-93547 being exploited in the wild.
How severe is CVE-2026-93547?
Informational severity, published 30 September 2026.
Which products and versions are affected?
Vaadin 23.1.0-23.6.13, 24.0.0-24.9.21, 24.10.0-24.10.9, 25.0.0-25.1.11, 25.2.0-25.2.6; Vaadin Spreadsheet add-on 2.0.0-3.1.0.
Is there a fix for CVE-2026-93547?
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-2026-93547 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-93547?
Check whether you run Vaadin or Vaadin Spreadsheet add-on 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

A missing authorization check in the Vaadin Spreadsheet component allows authenticated users to add or replace cell comments via a network request without validating whether the user has permission to modify the target cell. The vulnerability affects the comment-writing functionality even when sheet protection is enabled and cells are marked as locked. Fixes are available in patched versions across multiple Vaadin release branches.

Affected products

  • Vaadin Vaadin 23.1.0-23.6.13, 24.0.0-24.9.21, 24.10.0-24.10.9, 25.0.0-25.1.11, 25.2.0-25.2.6
  • Vaadin Vaadin Spreadsheet add-on 2.0.0-3.1.0

Timeline

  • 2026-09-30: disclosed

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