SSRF in Onlyoffice Documentserver
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published .
CVSS v3 metric
CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0 (patch)
- github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md (release-notes, issue-tracking)
- www.vulncheck.com/advisories/onlyoffice-documentserver-before-ssrf-via-download… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-110652?
- CVE-2026-110652 is a medium-severity vulnerability in Onlyoffice Documentserver, classified under Server-Side Request Forgery (SSRF). CVSS score: 4.0/10. Published 2026-10-14.
- How severe is CVE-2026-110652?
- Medium severity. CVSS v3 base score is 4.0 out of 10.