Answer in brief
CVE-2026-120350 records a Medium severity (CVSS 5.1) vulnerability in Stored Cross-Site Scripting in the Vaadin Rich Text Editor via an Unescaped Video Embed. The current sources do not mark it as known exploited. The current feed maps vaadin/com.vaadin:vaadin (generic), vaadin/com.vaadin:vaadin-core (generic), vaadin/com.vaadin:vaadin-rich-text-editor-flow (generic), vaadin/@vaadin/rich-text-editor (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps vaadin/com.vaadin:vaadin (generic), vaadin/com.vaadin:vaadin-core (generic), vaadin/com.vaadin:vaadin-rich-text-editor-flow (generic), vaadin/@vaadin/rich-text-editor (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| vaadin/com.vaadin:vaadingeneric | >=25.0.0 <=25.0.13 || >=25.1.0 <=25.1.13 || >=25.2.0 <25.2.13 || >=25.3.0 <25.3.5 | 25.2.13, 25.3.5 |
| vaadin/com.vaadin:vaadin-coregeneric | >=25.0.0 <=25.0.13 || >=25.1.0 <=25.1.13 || >=25.2.0 <25.2.13 || >=25.3.0 <25.3.5 | 25.2.13, 25.3.5 |
| vaadin/com.vaadin:vaadin-rich-text-editor-flowgeneric | >=25.0.0 <=25.0.13 || >=25.1.0 <=25.1.13 || >=25.2.0 <25.2.13 || >=25.3.0 <25.3.5 | 25.2.13, 25.3.5 |
| vaadin/@vaadin/rich-text-editorgeneric | >=25.0.0 <=25.0.13 || >=25.1.0 <=25.1.14 || >=25.2.0 <25.2.17 || >=25.3.0 <25.3.5 | 25.2.17, 25.3.5 |
Published upstream
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 10, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 10, 2026
The Vaadin Rich Text Editor exports a video embed without escaping its value, and then parses the resulting HTML into live DOM. A value crafted to break out of the href attribute therefore runs script in the viewer's browser. An attacker who can edit shared content pastes a video embed carrying the payload, the delta is stored, and the script runs when any user opens the page, including in read only mode. Only content persisted through asDelta() is affected. The default HTML value, set and read through setValue and getValue, is sanitized on the server with a safelist that has no iframe, so the embed does not survive that path. Vaadin 24 and older are not affected: they build the HTML value from the editor's own innerHTML, which the browser escapes. Users of affected versions should apply the following mitigation or upgrade. Releases that have fixed this issue include: Product version Vaadin 25.0.0 - 25.0.13 Vaadin 25.1.0 - 25.1.13 Vaadin 25.2.0 - 25.2.12 Vaadin 25.3.0 - 25.3.4 Mitigation No fixed release on this line, upgrade to 25.2.13 or newer No fixed release on this line, upgrade to 25.2.13 or newer Upgrade to 25.2.13 Upgrade to 25.3.5
Quoted source text, attributed separately from HOL analysis.