CVE-2025-30342

Public Exploit

Description

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.

References

Link	Tags
https://www.x41-dsec.de/lab/advisories/x41-2025-001-OpenSlides	third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2025-30342?: CVE-2025-30342 has been scored as a medium severity vulnerability.
How to fix CVE-2025-30342?: To fix CVE-2025-30342, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-30342 being actively exploited in the wild?: It is possible that CVE-2025-30342 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-30342?: CVE-2025-30342 affects Intevation OpenSlides.

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Description

Category

CWE-79 – Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

Frequently Asked Questions