What’s Vulnerable › Vulnerabilities

CVE-2026-110652: ONLYOFFICE DocumentServer before 10.0.0 SSRF via downloadfile isInJwtToken Bypass

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-16
• Weakness: CWE-918

Description

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.

Affected products

• ONLYOFFICE DocumentServer: from 2.5.0 before 10.0.0 — fixed in 10.0.0

How to fix

Upgrade to a fixed version: ONLYOFFICE DocumentServer 10.0.0. Check the vendor advisory for mitigations.

References

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

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