---
id: CVE-2026-84282
title: >-
  A Server-Side Request Forgery (SSRF) vulnerability exists in the ONLYOFFICE
  ownCloud Integration plugin version 9.12
summary: >-
  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 UR…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-918
  - CWE-20
  - CWE-601
vendor: Ascensio System SIA / OnlyOffice
product: ONLYOFFICE ownCloud integration plugin
affected:
  - onlyoffice_owncloud_integration_plugin 9.12
published: '2026-09-08'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T18:18:09.300'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84282'
references:
  - url: >-
      https://github.com/ONLYOFFICE/onlyoffice-owncloud/blob/master/controller/settingsapicontroller.php
    label: cret@cert.org
  - url: 'https://kb.cert.org/vuls/id/943094'
    label: cret@cert.org
  - url: 'https://www.kb.cert.org/vuls/id/943094'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T17:58:23.276605Z'
epss: 0.00201
epssPercentile: 0.10249
ingestedAt: '2026-09-08T15:33:26.986Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.