XSS in Intevation Openslides
CVE-2025-30342
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.
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.002 (15.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.
Affected products
- Intevation Openslides — versions 0
- Openslides
Weakness classification (CWE)
References
- cve@mitre.org (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-30342?
- CVE-2025-30342 is a medium-severity vulnerability in Intevation Openslides, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2025-03-21.
- How severe is CVE-2025-30342?
- Medium severity. CVSS v3 base score is 5.4 out of 10.