Vaadin Rich Text Editor up to 25.0.12/25.1.12/25.2.11/25.3.3 asDelta cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in Vaadin Rich Text Editor up to 25.0.12/25.1.12/25.2.11/25.3.3. This vulnerability affects the function asDelta. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-120350. Remote exploitation of the attack is possible. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Vaadin Rich Text Editor up to 25.0.12/25.1.12/25.2.11/25.3.3. It has been declared as problematic. Affected by this vulnerability is the function asDelta. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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

The advisory is shared at vaadin.com. This vulnerability is known as CVE-2026-120350 since 11/01/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 25.0.13, 25.1.13, 25.2.13 or 25.3.5 eliminates this vulnerability.

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Productinfo

Vendor

• Vaadin

Name

• Rich Text Editor

Version

• 25.0.0
• 25.0.1
• 25.0.2
• 25.0.3
• 25.0.4
• 25.0.5
• 25.0.6
• 25.0.7
• 25.0.8
• 25.0.9
• 25.0.10
• 25.0.11
• 25.0.12
• 25.1.0
• 25.1.1
• 25.1.2
• 25.1.3
• 25.1.4
• 25.1.5
• 25.1.6
• 25.1.7
• 25.1.8
• 25.1.9
• 25.1.10
• 25.1.11
• 25.1.12
• 25.2.0
• 25.2.1
• 25.2.2
• 25.2.3
• 25.2.4
• 25.2.5
• 25.2.6
• 25.2.7
• 25.2.8
• 25.2.9
• 25.2.10
• 25.2.11
• 25.3.0
• 25.3.1
• 25.3.2
• 25.3.3

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