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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-84282
StatePUBLISHED
Assignercertcc
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 15:18:51 UTC
Updated2026-09-10 18:18:09 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from ADP

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.001630000 probability, percentile 0.057750000 (date 2026-09-10)

Problem Types: CWE-918 Server-Side Request Forgery (SSRF) | CWE-20 Improper Input Validation | CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED6.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary6.5MEDIUMCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Ascensio System SIA OnlyOffice ONLYOFFICE OwnCloud Integration Plugin affected 9.12 Not specified

References

ReferenceSourceLinkTags
kb.cert.org/vuls/id/943094 [email protected] kb.cert.org
github.com/ONLYOFFICE/onlyoffice-owncloud/blob/master/controller/setting... [email protected] github.com
www.kb.cert.org/vuls/id/943094 af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
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