Stored Cross-Site Scripting in the Vaadin Rich Text Editor via an Unescaped Video Embed

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-120350
StatePUBLISHED
AssignerVaadin
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-10 12:17:17 UTC
Updated2026-11-10 12:17:17 UTC
DescriptionThe 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

Risk And Classification

Primary CVSS: v4.0 5.1 MEDIUM from [email protected]

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary5.1MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/C...
4.0CNACVSS5.1MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
Passive
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
Low
Sub Integrity
Low
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Vaadin Vaadin affected 25.0.0 25.0.13 maven Not specified
CNA Vaadin Vaadin affected 25.1.0 25.1.13 maven Not specified
CNA Vaadin Vaadin affected 25.2.0 25.2.13 maven Not specified
CNA Vaadin Vaadin affected 25.3.0 25.3.5 maven Not specified
CNA Vaadin Vaadin-core affected 25.0.0 25.0.13 maven Not specified
CNA Vaadin Vaadin-core affected 25.1.0 25.1.13 maven Not specified
CNA Vaadin Vaadin-core affected 25.2.0 25.2.13 maven Not specified
CNA Vaadin Vaadin-core affected 25.3.0 25.3.5 maven Not specified
CNA Vaadin Vaadin-rich-text-editor-flow affected 25.0.0 25.0.13 maven Not specified
CNA Vaadin Vaadin-rich-text-editor-flow affected 25.1.0 25.1.13 maven Not specified
CNA Vaadin Vaadin-rich-text-editor-flow affected 25.2.0 25.2.13 maven Not specified
CNA Vaadin Vaadin-rich-text-editor-flow affected 25.3.0 25.3.5 maven Not specified
CNA Vaadin Rich-text-editor affected 25.0.0 25.0.13 semver Not specified
CNA Vaadin Rich-text-editor affected 25.1.0 25.1.14 semver Not specified
CNA Vaadin Rich-text-editor affected 25.2.0 25.2.17 semver Not specified
CNA Vaadin Rich-text-editor affected 25.3.0 25.3.5 semver Not specified

References

ReferenceSourceLinkTags
github.com/vaadin/web-components/pull/13272 [email protected] github.com
github.com/advisories/GHSA-v3m3-f69x-jf25 [email protected] github.com
vaadin.com/security/cve-2026-120350 [email protected] vaadin.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Users of affected versions should apply the following mitigation or upgrade.

Workarounds

CNA: Persist the editor content through the default HTML value, set and read with setValue and getValue, which is sanitized on the server, rather than through asDelta(). An application that must use asDelta() should strip video inserts from the delta before storing or replaying it.

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