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 XSS.
Does this matter?
Lower severity and a low EPSS score (1.49%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 6.1 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- EPSS
- 1.49% probability · 74th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-209, CWE-79
- Affected
- nextcloud/nextcloud server · owncloud/owncloud
- Source
- support@hackerone.com
EPSS 1.5% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/97284Third Party Advisory, VDB Entry
- https://github.com/nextcloud/server/commit/94975af6db1551c2d23136c2ea22866a5b416070Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/044ee072a647636b1a17c89265c7233b35371335Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/b7fa2c5dc945b40bc6ed0a9a0e47c282ebf043e1Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/efa35d621dc7ff975468e636a5d1c153511296dcIssue Tracking, Patch, Third Party Advisory
- https://hackerone.com/reports/146278Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-002Patch, Vendor Advisory
- https://owncloud.org/security/advisory?id=oc-sa-2016-012Patch, Vendor Advisory
- http://www.securityfocus.com/bid/97284Third Party Advisory, VDB Entry
- https://github.com/nextcloud/server/commit/94975af6db1551c2d23136c2ea22866a5b416070Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/044ee072a647636b1a17c89265c7233b35371335Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/b7fa2c5dc945b40bc6ed0a9a0e47c282ebf043e1Issue Tracking, Patch, Third Party Advisory
- https://github.com/owncloud/core/commit/efa35d621dc7ff975468e636a5d1c153511296dcIssue Tracking, Patch, Third Party Advisory
- https://hackerone.com/reports/146278Exploit, Third Party Advisory
- https://nextcloud.com/security/advisory/?id=nc-sa-2016-002Patch, Vendor Advisory
- https://owncloud.org/security/advisory?id=oc-sa-2016-012Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.