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CVE-2026-84282

Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin

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 Score
—
Unrated
EPSS — Exploit Probability
0.3%
Riskier than 18% of all CVEs · checked 2026-10-22
Exploitation
Not in CISA KEV
KEV does not include every exploited vulnerability
Remediation
Unconfirmed
Check vendor advisories
NVD entry PoC / advisory

1 article across 1 outlet · first covered Sep 8, 2026 · latest Sep 8, 2026

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