# CVE-2025-30342: Cross-site scripting in OpenSlides

> Attackers can inject JavaScript via link attributes in OpenSlides, executing code in victim sessions to potentially take over accounts.

- **Severity:** Medium 5.4 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N`)
- **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 available:** No
- **Published:** 21 Mar 2025
- **Updated:** 21 Mar 2025
- **Also known as:** GHSA-6h9q-x65f-g9gv

## What is CVE-2025-30342?

CVE-2025-30342 is a medium-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 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.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2025-30342?

It affects 1 product.


Products: Openslides Openslides.

## How do I fix CVE-2025-30342?

No fix has been published for CVE-2025-30342 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-30342 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30342 exists.

## Other vulnerabilities in Intevation OpenSlides

- [CVE-2020-26280](https://insights.sbomify.com/CVE-2020-26280/): XSS in OpenSlides (high 8.9)
- [CVE-2026-25519](https://insights.sbomify.com/CVE-2026-25519/): OpenSlides has incorrect access control vulnerability in authentication service (high 8.1)
- [CVE-2024-22892](https://insights.sbomify.com/CVE-2024-22892/): Weak cryptography in n/a (high 7.5)
- [CVE-2024-22893](https://insights.sbomify.com/CVE-2024-22893/): Information disclosure in n/a (high 7.5)
- [CVE-2025-30344](https://insights.sbomify.com/CVE-2025-30344/): Information disclosure in OpenSlides (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-30342 and fix it if it is affected.

What it is: CVE-2025-30342 is a medium-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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-30342 exists.

Affected product: Intevation OpenSlides. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-30342/ (Markdown: https://insights.sbomify.com/CVE-2025-30342/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-30342
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-30342
- OSV: https://osv.dev/vulnerability/CVE-2025-30342

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-30342/
Summaries are generated and may contain mistakes; the official description above is the record.