Medium 6.5Published Sep 8, 2026

CVE-2026-84282A Server-Side Request Forgery (SSRF) vulnerability exists in the ONLYOFFICE ownCloud Integration plugin (version 9.12)

Updated under an hour ago (2026-10-19 06:50 UTC)

Does this affect you?

It affects Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin

Exploited in the last 30 days

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.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-918, CWE-20, CWE-601
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: certcc
NVD analysis: Deferred
Record last updated: Sep 10, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin ascensio_system_sia_onlyoffice:onlyoffice_owncloud_integration_plugin (from the name)	9.12	CNA record

References

https://github.com/ONLYOFFICE/onlyoffice-owncloud/blob/master/controller/settingsapicontroller.php
https://kb.cert.org/vuls/id/943094
https://www.kb.cert.org/vuls/id/943094

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.