Protected-cell comment modification via missing authorization
Published Sep 30, 2026 · Updated Sep 30, 2026
Missing authorization in affected Vaadin Spreadsheet releases allows remote authenticated users to write comments on protected sheets. The cell-comment update path does not enforce sheet protection or cell locks before adding or replacing a comment; targeting a nonexistent cell also creates its row and cell. Exploitation requires access to an application that renders an affected spreadsheet, and the demonstrated impact is unauthorized modification of sheet comments and structure.
Summary
What happened
Missing authorization in affected Vaadin Spreadsheet releases allows remote authenticated users to write comments on protected sheets. The cell-comment update path does not enforce sheet protection or cell locks before adding or replacing a comment; targeting a nonexistent cell also creates its row and cell. Exploitation requires access to an application that renders an affected spreadsheet, and the demonstrated impact is unauthorized modification of sheet comments and structure.
The record
- CVE
- CVE-2026-93547
- Published
- Sep 30, 2026
- Updated
- Sep 30, 2026
- Vendor
- Vaadin
- Product
- Vaadin Framework
- Classifications
- T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 30, 2026CVE publishedPublication date reported by the CVE source.
- Sep 30, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=23.1.0 <23.6.14
- Affected versionversion=24.0.0 <24.9.22
- Affected versionversion=24.10.0 <24.10.10
- Affected versionversion=25.0.0 <25.1.12
- Affected versionversion=25.2.0 <25.2.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Activity data is delayed. The latest report is Sep 28, 2026.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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