How severe is GHSA-7wwv-79xw-rvvg?

No CVSS score has been assigned to GHSA-7wwv-79xw-rvvg yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-7wwv-79xw-rvvg?

GHSA-7wwv-79xw-rvvg affects the following packages: com.vaadin:vaadin-server (Maven), com.vaadin:vaadin-server (Maven), com.vaadin:vaadin (Maven), com.vaadin:vaadin (Maven), com.vaadin:vaadin (Maven), com.vaadin:vaadin-spreadsheet-flow (Maven), com.vaadin:vaadin-spreadsheet-flow (Maven), com.vaadin:vaadin-spreadsheet-flow (Maven). Ecosystems affected: Maven.

How do I fix GHSA-7wwv-79xw-rvvg?

Update com.vaadin:vaadin-server to 7.7.50 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7wwv-79xw-rvvg is resolved across your whole dependency graph.

How do I detect GHSA-7wwv-79xw-rvvg in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.vaadin:vaadin-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-7wwv-79xw-rvvg if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is GHSA-7wwv-79xw-rvvg actively exploited in the wild?

No public exploit code has been indexed for GHSA-7wwv-79xw-rvvg yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-7wwv-79xw-rvvg?

GHSA-7wwv-79xw-rvvg has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 27th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-7wwv-79xw-rvvg?

GHSA-7wwv-79xw-rvvg is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-7wwv-79xw-rvvg published, and has it been updated?

GHSA-7wwv-79xw-rvvg was published on January 5, 2026 and was last updated on September 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

Vaadin vulnerable to Cross-site ScriptingGHSA-7wwv-79xw-rvvg

Fix: vaadin/flow-components#8285

GHSA-7wwv-79xw-rvvg is a Cross-site Scripting (XSS) vulnerability in com.vaadin:vaadin-server. A fix is available for com.vaadin:vaadin-server — see the affected versions and patch details below.

Also known asCVE-2025-15022

Published

Jan 5, 2026

Updated

Sep 10, 2026

Affected

8 pkgs

Patched

8 / 8

Exploits

None indexed

Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-7wwv-79xw-rvvg.

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs27th percentile — riskier than 27% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

8 pkgs affected

☕com.vaadin:vaadin-server☕com.vaadin:vaadin-server☕com.vaadin:vaadin☕com.vaadin:vaadin☕com.vaadin:vaadin☕com.vaadin:vaadin-spreadsheet-flow☕com.vaadin:vaadin-spreadsheet-flow☕com.vaadin:vaadin-spreadsheet-flow

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Action captions in Vaadin accept HTML by default but were not sanitized, potentially allowing Cross-site Scripting (XSS) if caption content is derived from user input.

In Vaadin Framework 7 and 8, the Action class is a general-purpose class that may be used by multiple components. The fixed versions sanitize captions by default and provide an API to explicitly enable HTML content mode for backwards compatibility.

In Vaadin 23 and newer, the Action class is only used by the Spreadsheet component. The fixed versions sanitize HTML using Jsoup with a relaxed safelist.

Vaadin 14 is not affected as Spreadsheet component was not supported.

Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include:

Product version Vaadin 7.0.0 - 7.7.49 Vaadin 8.0.0 - 8.29.1 Vaadin 23.1.0 - 23.6.5 Vaadin 24.0.0 - 24.8.13 Vaadin 24.9.0 - 24.9.6

Mitigation Upgrade to 7.7.50 Upgrade to 8.30.0 Upgrade to 23.6.6 Upgrade to 24.8.14 or 24.9.7 Upgrade to 25.0.0 or newer

Artifacts Maven coordinatesVulnerable versionsFixed versioncom.vaadin:vaadin-server 7.0.0 - 7.7.49 ≥7.7.50 com.vaadin:vaadin-server 8.0.0 - 8.29.1 ≥8.30.0 com.vaadin:vaadin 23.1.0 - 23.6.5 ≥23.6.6 com.vaadin:vaadin24.0.0 - 24.8.13 ≥24.8.14 com.vaadin:vaadin24.9.0 - 24.9.6 ≥24.9.7 com.vaadin:vaadin-spreadsheet-flow 23.1.0 - 23.6.5 ≥23.6.6 com.vaadin:vaadin-spreadsheet-flow 24.0.0 - 24.8.13 ≥24.8.14 com.vaadin:vaadin-spreadsheet-flow 24.9.0 - 24.9.6 ≥24.9.7

Affected Packages

8 total 8 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.vaadin:vaadin-server`	≥ 7.0.0&&< 7.7.50	7.7.50`com.vaadin:vaadin-server:7.7.50`
☕Maven	`com.vaadin:vaadin-server`	≥ 8.0.0&&< 8.30.0	8.30.0`com.vaadin:vaadin-server:8.30.0`
☕Maven	`com.vaadin:vaadin`	≥ 23.1.0&&< 23.6.6	23.6.6`com.vaadin:vaadin:23.6.6`
☕Maven	`com.vaadin:vaadin`	≥ 24.0.0&&< 24.8.14	24.8.14`com.vaadin:vaadin:24.8.14`
☕Maven	`com.vaadin:vaadin`	≥ 24.9.0&&< 24.9.7	24.9.7`com.vaadin:vaadin:24.9.7`
☕Maven	`com.vaadin:vaadin-spreadsheet-flow`	≥ 23.1.0&&< 23.6.6	23.6.6`com.vaadin:vaadin-spreadsheet-flow:23.6.6`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.vaadin:vaadin-server, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.vaadin:vaadin-server to 7.7.50 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7wwv-79xw-rvvg is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Action captions in Vaadin accept HTML by default but were not sanitized, potentially allowing Cross-site Scripting (XSS) if caption content is derived from user input. In Vaadin Framework 7 and 8, the Action class is a general-purpose class that may be used by multiple components. The fixed versions sanitize captions by default and provide an API to explicitly enable HTML content mode for backwards compatibility. In Vaadin 23 and newer, the Action class is only used by the Spreadsheet component. The fixed versions sanitize HTML using Jsoup with a relaxed safelist. Vaadin 14 is not affected

O3 Security · Impact-Aware SCA

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