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

Status: published. Published: 2026-10-14. Updated: 2026-11-08.

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.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: VulnCheck) — https://github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0

## Affected products and versions

- ONLYOFFICE / DocumentServer (ONLYOFFICE/DocumentServer): ≥ 2.5.0; < 10.0.0 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 4 (medium); CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: 0.40% as of 2026-11-08; percentile 34.28%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-918

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/ONLYOFFICE/DocumentServer/releases/tag/v10.0.0 (CNA: VulnCheck; patch, release-notes)

- https://github.com/ONLYOFFICE/DocumentServer/blob/master/CHANGELOG.md#1000 (CNA: VulnCheck; issue-tracking, release-notes)

- https://www.vulncheck.com/advisories/onlyoffice-documentserver-before-ssrf-via-downloadfile-isinjwttoken-bypass (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-110652; retrieved 2026-11-08; source updated 2026-11-08

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-110652; retrieved 2026-11-08; source updated Not reported

Revision: 320783cff2278b49a8982ca0e48b3f87d0bcf4de1d4fd56f7857c2517fe57b4b

Canonical: https://y2.dev/cve/CVE-2026-110652

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