CVE-2026-107588
Description
A flaw was found in Vaadin Charts. Untrusted input passed into chart configuration settings can trigger vulnerabilities in the bundled chart rendering library, enabling an attacker to perform Cross-Site Scripting (XSS) and prototype pollution. A remote attacker who can control chart configuration properties could exploit these issues to execute arbitrary scripts in a user's browser session or tamper with application behavior.
Statement
This vulnerability is rated Moderate because exploitation requires non-default application behavior where untrusted external data is ingested into chart configuration parameters. Because chart settings in typical deployments are statically defined on the server rather than mapped directly to user-supplied input, exposure remains limited. Furthermore, achieving cross-site scripting or prototype pollution typically depends on specific user interactions, such as initiating print actions or interacting with chart links, restricting the attack blast radius to client-side sessions.
Understanding the Weakness (CWE)
Access Control,Confidentiality
Technical Impact: Bypass Protection Mechanism; Read Application Data
The most common attack performed with cross-site scripting involves the disclosure of private information stored in user cookies, such as session information. Typically, a malicious user will craft a client-side script, which -- when parsed by a web browser -- performs some activity on behalf of the victim to an attacker-controlled system (such as sending all site cookies to a given E-mail address). This could be especially dangerous to the site if the victim has administrator privileges to manage that site. This script will be loaded and run by each user visiting the web site. Since the site requesting to run the script has access to the cookies in question, the malicious script does also.
Integrity,Confidentiality,Availability
Technical Impact: Execute Unauthorized Code or Commands
In some circumstances it may be possible to run arbitrary code on a victim's computer when cross-site scripting is combined with other flaws, for example, "drive-by hacking."
Confidentiality,Integrity,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism; Read Application Data
The consequence of an XSS attack is the same regardless of whether it is stored or reflected. The difference is in how the payload arrives at the server. XSS can cause a variety of problems for the end user that range in severity from an annoyance to complete account compromise. Some cross-site scripting vulnerabilities can be exploited to manipulate or steal cookies, create requests that can be mistaken for those of a valid user, compromise confidential information, or execute malicious code on the end user systems for a variety of nefarious purposes. Other damaging attacks include the disclosure of end user files, installation of Trojan horse programs, redirecting the user to some other page or site, running "Active X" controls (under Microsoft Internet Explorer) from sites that a user perceives as trustworthy, and modifying presentation of content.
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