Vulnerability · Published Mar 21, 2025 · Assigned by mitre
CVE-2025-30342
Medium 5.4
In plain English
A medium-severity cross-site scripting in OpenSlides from Intevation. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Intevation | OpenSlides | 0 – before 4.2.5 |
Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N