# CVE-2026-110652: ONLYOFFICE DocumentServer server-side request forgery in /downloadfile

Source: https://junglewise.ai/threats/cve-2026-110652-onlyoffice-documentserver-before-10-0-0-contains-an  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-14. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-110652 · Severity: medium · CVSS 4 · Published 2026-10-14

ONLYOFFICE DocumentServer is a document editing and collaboration service. An unauthenticated attacker can exploit a server-side request forgery vulnerability in the file download endpoint to bypass security filters and access internal networks, cloud metadata, and private systems when JWT verification is disabled in the default configuration.

Vendors: [ONLYOFFICE](https://junglewise.ai/threats/vendors/onlyoffice).

## Quick answers

**Is CVE-2026-110652 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-110652 being exploited in the wild.

**How severe is CVE-2026-110652?** Medium severity, with a CVSS score of 4, published 14 October 2026.

**Which products and versions are affected?** ONLYOFFICE DocumentServer before 10.0.0.

**Is there a fix for CVE-2026-110652?** Yes: fixed in 10.0.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-110652 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-110652?** Check whether you run ONLYOFFICE DocumentServer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in 10.0.0

## Technical details

The /downloadfile/:docid endpoint fails to validate private-IP addresses when the isInJwtToken flag is set and JWT verification is disabled, allowing attackers to craft requests that bypass the request-filtering-agent. By submitting internal or loopback URLs, an attacker can cause the server to fetch and proxy back arbitrary private-network and cloud metadata content without authentication.

## Affected products

- ONLYOFFICE DocumentServer before 10.0.0

## Timeline

- 2026-10-14: disclosed

## References

- [https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md](https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md)
- [https://github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0](https://github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0)