CVE-2026-124688 Cross-Site Scripting via the spriteCssClass Field in Kendo UI for jQuery
Attackers controlling mapped data can inject event-handler attributes into Kendo UI widgets, running JavaScript in victims' sessions; apps using these widgets should care.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Harmful if only installed
- No
- Needs a specific call
- Yes
- Fix
- None listed
What is CVE-2026-124688?
CVE-2026-124688 is a high-severity cross-site scripting vulnerability in Progress Software Kendo UI for jQuery, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
In Progress® Kendo® UI for jQuery prior to 2026.4.1111 the TabStrip, PanelBar, and Menu widgets support mapping a dataSource field to `spriteCssClass`. If an attacker can control the mapped data, they can break out of the attribute and inject markup, including event-handler attributes. The resulting JavaScript executes in the application's origin when a victim loads a page that renders the affected widget, allowing access to data and actions available in the victim's authenticated session.
Weakness: CWE-80
Which versions are affected by CVE-2026-124688?
An affected version is only exploitable if your software calls TabStrip, PanelBar or Menu. Many projects that include it are not exposed.
How do I fix CVE-2026-124688?
No fix has been published for CVE-2026-124688 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-124688 being exploited?
There is no known exploitation of CVE-2026-124688 in the wild and no public exploit code.
Sources
Also known as GHSA-rhfv-9jwg-f856.