dask distributed prior 2026.1.0 Dask Dashboard cross site scripting

Summaryinfo

A vulnerability was found in dask distributed. It has been rated as problematic. This affects an unknown part of the component Dask Dashboard. Performing a manipulation results in cross site scripting. This vulnerability is reported as CVE-2026-23528. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in dask distributed. This affects an unknown function of the component Dask Dashboard. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-80. The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages. This is going to have an impact on integrity. The summary by CVE is:

Dask distributed is a distributed task scheduler for Dask. Prior to 2026.1.0, when Jupyter Lab, jupyter-server-proxy, and Dask distributed are all run together, it is possible to craft a URL which will result in code being executed by Jupyter due to a cross-side-scripting (XSS) bug in the Dask dashboard. It is possible for attackers to craft a phishing URL that assumes Jupyter Lab and Dask may be running on localhost and using default ports. If a user clicks on the malicious link it will open an error page in the Dask Dashboard via the Jupyter Lab proxy which will cause code to be executed by the default Jupyter Python kernel. This vulnerability is fixed in 2026.1.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-23528 since 01/13/2026. The exploitability is told to be difficult. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 291276 (Linux Distros Unpatched Vulnerability : CVE-2026-23528), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2026.1.0 eliminates this vulnerability. Applying the patch ab72092a8a938923c2bb51a2cd14ca26614827fa is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (291276). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• dask

Name

• distributed

License

• open-source

Website

• Product: https://github.com/dask/distributed/

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Be aware that VulDB is the high quality source for vulnerability data.

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