CVE-2025-30345 Cross-site scripting in OpenSlides

Low 3.5 Published 21 Mar 2025 Updated 21 Mar 2025

Attackers can inject malicious scripts via chat names in OpenSlides, potentially executing code in victim browsers.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2025-30345?

CVE-2025-30345 is a low-severity cross-site scripting vulnerability in Intevation OpenSlides, published on 21 Mar 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

An issue was discovered in OpenSlides before 4.2.5. When creating new chats via the chat_group.create action, the user is able to specify the name of the chat. Some HTML elements such as SCRIPT are filtered, whereas others are not. In most cases, HTML entities are encoded properly, but not when deleting chats or deleting messages in these chats. This potentially allows attackers to interfere with the layout of the rendered website, but it is unlikely that victims would click on deleted chats or deleted messages.

Weakness: CWE-79, CWE-116

Which versions are affected by CVE-2025-30345?

It affects 1 product.

Products include Openslides Openslides.

How do I fix CVE-2025-30345?

No fix has been published for CVE-2025-30345 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-30345 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30345 exists.

Sources

Also known as GHSA-fw4x-j9wf-qmp2.