# CVE-2023-49782: Cross-Site-Scripting vulnerability in error message passing in richdocumentscode

> Attackers can execute arbitrary scripts via proxy.php in Collabora Online, potentially compromising user sessions and data.

- **Severity:** High 7.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 8 Dec 2023
- **Updated:** 2 Aug 2024

## What is CVE-2023-49782?

CVE-2023-49782 is a high-severity cross-site scripting vulnerability in CollaboraOnline online, published on 8 Dec 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Collabora Online is a collaborative online office suite based on LibreOffice technology. Users of Nextcloud with `Collabora Online - Built-in CODE Server` app can be vulnerable to attack via proxy.php. The bug was fixed in Collabora Online - Built-in CODE Server (richdocumentscode) release 23.5.601. Users are advised to upgrade. There are no known workarounds for this vulnerability.

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

## Which versions are affected by CVE-2023-49782?

It affects 1 product.


Products: Collaboraoffice Richdocumentscode.

## How do I fix CVE-2023-49782?

No fix has been published for CVE-2023-49782 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-49782 being exploited?

There is no known exploitation of CVE-2023-49782 in the wild and no public exploit code.

## Other vulnerabilities in CollaboraOnline online

- [CVE-2023-49788](https://insights.sbomify.com/CVE-2023-49788/): Improper handling of browser-side provided input in richdocuments path handling (high 7.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-49782 and fix it if it is affected.

What it is: CVE-2023-49782 is a high-severity cross-site scripting vulnerability in CollaboraOnline online, published on 8 Dec 2023. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2023-49782 in the wild and no public exploit code.

Affected product: CollaboraOnline online. 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-2023-49782/ (Markdown: https://insights.sbomify.com/CVE-2023-49782/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-49782
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-49782
- OSV: https://osv.dev/vulnerability/CVE-2023-49782

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-49782/
Summaries are generated and may contain mistakes; the official description above is the record.