What is the CVSS score of CVE-2025-30342?

CVE-2025-30342 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.1%.

Which versions of Openslides are affected by CVE-2025-30342?

Organizations using OpenSlides should be aware of moderate risk from CVE-2025-30342, a cross-site scripting vulnerability rated CVSS 5.4.

Is there a public PoC exploit available for CVE-2025-30342?

Yes, a public proof-of-concept exploit is available for CVE-2025-30342. Prioritise patching immediately. EPSS: 0.1%.

How to fix or mitigate CVE-2025-30342?

Within 30 days: Identify affected systems running OpenSlides and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.

Openslides CVE-2025-30342

MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2025-03-21 cve@mitre.org

XSS Openslides

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:32 vuln.today

PoC Detected

Mar 27, 2025 - 13:35 vuln.today

Public exploit code

CVE Published

Mar 21, 2025 - 06:15 nvd

MEDIUM 5.4

DescriptionCVE.org

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.

AnalysisAI

An XSS issue was discovered in OpenSlides before 4.2.5. Rated medium severity (CVSS 5.4), this vulnerability is remotely exploitable, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Cross-Site Scripting (XSS) (CWE-79), which allows attackers to inject malicious scripts into web pages viewed by other users. 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 include: Openslides. Version information: before 4.2.5..

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Sanitize all user input, use Content-Security-Policy headers, encode output contextually (HTML, JS, URL). Use frameworks with built-in XSS protection.