CVE-2026-84282 A Server-Side Request Forgery (SSRF) vulnerability exists in the ONLYOFFICE ownCloud Integration plugin (version 9.12)
An authenticated administrator can exploit an SSRF vulnerability in the ONLYOFFICE ownCloud plugin to perform internal network reconnaissance and port scanning.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84282?
CVE-2026-84282 is a medium-severity server-side request forgery vulnerability in Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin, published on 8 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A Server-Side Request Forgery (SSRF) vulnerability exists in the ONLYOFFICE ownCloud Integration plugin version 9.12. The /apps/onlyoffice/ajax/settings/address endpoint does not sufficiently validate the user-supplied Document Server URL before initiating outbound connections. An authenticated administrator can manipulate the document server parameter to cause the ownCloud server to send arbitrary requests to attacker-controlled destinations, including localhost and internal network hosts. This allows internal network reconnaissance and TCP port scanning based on differences in server responses.
Which versions are affected by CVE-2026-84282?
How do I fix CVE-2026-84282?
No fix has been published for CVE-2026-84282 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-84282 being exploited?
There is no known exploitation of CVE-2026-84282 in the wild and no public exploit code.
Sources
Also known as GHSA-wpfp-j2f8-c6vj.