# CVE-2026-93547: Missing authorization in vaadin

> Authenticated users can modify protected spreadsheet cells and comments due to missing authorization checks in the Vaadin Spreadsheet component.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 30 Sep 2026
- **Updated:** 3 Oct 2026
- **Also known as:** GHSA-74m8-whmf-rxrq

## What is CVE-2026-93547?

CVE-2026-93547 is a medium-severity missing authorization vulnerability in vaadin, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

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

Weakness: CWE-285 (Improper Authorization)

## Which versions are affected by CVE-2026-93547?


## How do I fix CVE-2026-93547?

No fix has been published for CVE-2026-93547 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-93547 being exploited?

There is no known exploitation of CVE-2026-93547 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93547 and fix it if it is affected.

What it is: CVE-2026-93547 is a medium-severity missing authorization vulnerability in vaadin, published on 30 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-93547 in the wild and no public exploit code.

Affected product: vaadin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93547/ (Markdown: https://insights.sbomify.com/CVE-2026-93547/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93547
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93547
- OSV: https://osv.dev/vulnerability/CVE-2026-93547

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93547/
Summaries are generated and may contain mistakes; the official description above is the record.