Intevation OpenSlides up to 4.2.4 HTML Element HTML injection

Summaryinfo

A vulnerability categorized as problematic has been discovered in Intevation OpenSlides up to 4.2.4. The impacted element is an unknown function of the component HTML Element Handler. Such manipulation leads to HTML injection. This vulnerability is referenced as CVE-2025-30342. It is possible to launch the attack remotely. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Intevation OpenSlides up to 4.2.4 and classified as problematic. Affected by this issue is an unknown functionality of the component HTML Element Handler. The manipulation with an unknown input leads to a html injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. CVE summarizes:

An XSS issue was discovered in OpenSlides before 4.2.5. When submitting descriptions such as Moderator Notes or Agenda Topics, an editor is shown that allows one to format the submitted text. This allows insertion of various HTML elements. When trying to insert a SCRIPT element, it is properly encoded when reflected; however, adding attributes to links is possible, which allows the injection of JavaScript via the onmouseover attribute and others. When a user moves the mouse over such a prepared link, JavaScript is executed in that user's session.

The advisory is shared for download at x41-dsec.de. This vulnerability is handled as CVE-2025-30342 since 03/21/2025. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 4.2.5 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-7271). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Intevation

Name

• OpenSlides

Version

• 4.2.0
• 4.2.1
• 4.2.2
• 4.2.3
• 4.2.4

CPE 2.3info

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CPE 2.2info

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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