What’s Vulnerable › Vulnerabilities
CVE-2025-30342
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2025-03-21 · updated 2026-06-17
- Weakness: CWE-79
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
- Intevation OpenSlides: before 4.2.5 — fixed in 4.2.5
How to fix
Upgrade to a fixed version: Intevation OpenSlides 4.2.5. Check the vendor advisory for mitigations.
References
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