# 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.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **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 (`TabStrip`, `PanelBar`, `Menu`)
- **Fix available:** No
- **Published:** 11 Nov 2026
- **Updated:** 11 Nov 2026
- **Also known as:** GHSA-rhfv-9jwg-f856

## 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 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## 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.

## Is CVE-2026-124688 being exploited?

There is no known exploitation of CVE-2026-124688 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-124688 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-124688 in the wild and no public exploit code.
Exposure: An affected version is only exploitable if your software calls TabStrip, PanelBar or Menu. Many projects that include it are not exposed.

Affected product: Progress Software Kendo UI for jQuery. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
   If an affected version is present, also search the code for calls to TabStrip, PanelBar or Menu and report whether any exist.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-124688/ (Markdown: https://insights.sbomify.com/CVE-2026-124688/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-124688
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-124688
- OSV: https://osv.dev/vulnerability/CVE-2026-124688

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-124688/
Summaries are generated and may contain mistakes; the official description above is the record.