Vaadin up to 25.2.6 Spreadsheet improper authorization

Summaryinfo

A vulnerability, which was classified as critical, was found in Vaadin up to 25.2.6. Impacted is an unknown function of the component Spreadsheet. Executing a manipulation can lead to improper authorization. This vulnerability is registered as CVE-2026-93547. It is possible to launch the attack remotely. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Vaadin up to 25.2.6. This vulnerability affects some unknown functionality of the component Spreadsheet. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A missing authorization check in the Vaadin Spreadsheet component allows an authenticated user of an application that renders a spreadsheet to add or replace cell comments on a sheet that has protection enabled, including on cells that are locked. Writing a comment to a cell that does not exist yet also creates the row and the cell. Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include: Product version Vaadin 23.1.0 - 23.6.13 Vaadin 24.0.0 - 24.9.21 Vaadin 24.10.0 - 24.10.9 Vaadin 25.0.0 - 25.1.11 Vaadin 25.2.0 - 25.2.6 Vaadin Framework 7 and 8 with the Spreadsheet add-on 2.0.0 - 3.1.0 Mitigation Upgrade to 23.6.14 Upgrade to 24.9.22 Upgrade to 24.10.10 Upgrade to 25.1.12 Upgrade to 25.2.7 or newer Upgrade the Spreadsheet add-on to 3.1.1 Please note that Vaadin versions 10-13 and 15-22 are no longer supported and you should update either to the latest 23, 24, 25 version. Artifacts Maven coordinates Vulnerable versions Fixed version com.vaadin:vaadin 23.1.0 - 23.6.13 >=23.6.14 com.vaadin:vaadin 24.0.0 - 24.9.21 >=24.9.22 com.vaadin:vaadin 24.10.0 - 24.10.9 >=24.10.10 com.vaadin:vaadin 25.0.0 - 25.1.11 >=25.1.12 com.vaadin:vaadin 25.2.0 - 25.2.6 >=25.2.7 com.vaadin:vaadin-spreadsheet-flow 23.1.0 - 23.6.13 >=23.6.14 com.vaadin:vaadin-spreadsheet-flow 24.0.0 - 24.9.21 >=24.9.22 com.vaadin:vaadin-spreadsheet-flow 24.10.0 - 24.10.9 >=24.10.10 com.vaadin:vaadin-spreadsheet-flow 25.0.0 - 25.1.11 >=25.1.12 com.vaadin:vaadin-spreadsheet-flow 25.2.0 - 25.2.6 >=25.2.7 com.vaadin:vaadin-spreadsheet 2.0.0 - 3.1.0 >=3.1.1

The advisory is shared for download at vaadin.com. This vulnerability was named CVE-2026-93547 since 09/18/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 23.6.14, 24.9.22, 24.10.10, 25.1.12, 25.2.7 or 3.1.1 eliminates this vulnerability.

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Productinfo

Name

• Vaadin

Version

• 3.0
• 3.1.0
• 23.6.0
• 23.6.1
• 23.6.2
• 23.6.3
• 23.6.4
• 23.6.5
• 23.6.6
• 23.6.7
• 23.6.8
• 23.6.9
• 23.6.10
• 23.6.11
• 23.6.12
• 23.6.13
• 24.9.0
• 24.9.1
• 24.9.2
• 24.9.3
• 24.9.4
• 24.9.5
• 24.9.6
• 24.9.7
• 24.9.8
• 24.9.9
• 24.9.10
• 24.9.11
• 24.9.12
• 24.9.13
• 24.9.14
• 24.9.15
• 24.9.16
• 24.9.17
• 24.9.18
• 24.9.19
• 24.9.20
• 24.9.21
• 24.10.0
• 24.10.1
• 24.10.2
• 24.10.3
• 24.10.4
• 24.10.5
• 24.10.6
• 24.10.7
• 24.10.8
• 24.10.9
• 25.1.0
• 25.1.1
• 25.1.2
• 25.1.3
• 25.1.4
• 25.1.5
• 25.1.6
• 25.1.7
• 25.1.8
• 25.1.9
• 25.1.10
• 25.1.11
• 25.2.0
• 25.2.1
• 25.2.2
• 25.2.3
• 25.2.4
• 25.2.5
• 25.2.6

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