CVE-2026-110652

ONLYOFFICE DocumentServer before 10.0.0 contains an unauthenticated server-side request forgery vulnerability in the /downloadfile/:docid endpoint that allows remote attackers to bypass the private-IP request-filtering-agent by exploiting the isInJwtToken flag when JWT verification is disabled in the default configuration. Attackers can submit a crafted request body containing an internal or loopback URL, which is treated as a DIRECT request skipping private-address filtering, causing the server to fetch and proxy back arbitrary private-network and cloud metadata content.

Score

CVSS 4.0 6.3 Medium

Status

Awaiting Analysis - disclosure@vulncheck.com

Published

2026-10-14

Last modified

2026-10-16

Weaknesses

CWE-918

Affected products

• Documentserver (Onlyoffice)

References

• https://github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0
• https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md#1000
• https://www.vulncheck.com/advisories/onlyoffice-documentserver-before-ssrf-via-downloadfile-isinjwttoken-bypass