# 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.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 8 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-wpfp-j2f8-c6vj

## 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.

## Is CVE-2026-84282 being exploited?

There is no known exploitation of CVE-2026-84282 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-84282 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-84282 in the wild and no public exploit code.

Affected product: Ascensio System SIA / OnlyOffice ONLYOFFICE ownCloud integration plugin. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-84282/ (Markdown: https://insights.sbomify.com/CVE-2026-84282/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-84282
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-84282
- OSV: https://osv.dev/vulnerability/CVE-2026-84282

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-84282/
Summaries are generated and may contain mistakes; the official description above is the record.