CVE-2026-120350 · Package
NO FIX YET · SEE WHAT TO DO
The Vaadin Rich Text Editor writes a video embed value into HTML without escaping it, then parses that HTML into live page content. A crafted value breaks out of the href attribute and runs script in the browser of anyone who opens the page, including read-only viewers.
first public Nov 10, 2026 · 1 source
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Apps built with Vaadin 25 that store rich text through asDelta() and let users edit shared content are exposed, because a stored video embed can carry the script. Vaadin 24 and older are not affected, and apps that only use the default setValue/getValue HTML value are not affected because the server sanitizer removes the iframe. Teams that do not persist deltas can skip it.
Not affected if default-html-value-only, no-asdelta-persistence, vaadin-24-or-older
Who cares java, rich-text-editor, vaadin
asDelta(); only content persisted through asDelta() is affected, while the default setValue/getValue HTML path is sanitized.25.2.13 or newer.25.2.13.25.3.5.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
This page as .md · .json · 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
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