CVE-2026-110385
8.7HighPublished 14 Oct 2026 · NVD status: Awaiting Analysis · AI triage by gemini-3.8-flash
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
- Impact
- Full C/I/A compromise
- Weakness
- CWE-73
Impact
Authenticated attackers with a valid Inbox-compatible JWT can execute arbitrary OS commands as the ds service account. They achieve this over the network by exploiting Document Server's Document Builder API.
Root cause
The builder.SaveFile() API improperly handles converter XML, allowing duplicate m_sFileTo elements to bypass the output path, overwrite runtime.json, and hijack executable paths.
Affected systems
ONLYOFFICE Document Server versions before 10.0.0
CVSS v4.0 · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Fix & remediation
Upgrade ONLYOFFICE Document Server to version 10.0.0 or later; no interim workaround is specified, so restrict network access to the Document Builder API if you cannot patch immediately.
$ sudo apt-get update && sudo apt-get install --only-upgrade onlyoffice-documentserverAI-suggested. Run it in staging first and check it against the vendor advisory. Why?
NVD description
A remote code execution vulnerability in ONLYOFFICE Document Server versions before10.0.0 allows an authenticated attacker with a valid Inbox-compatible JWT to execute arbitrary operating system commands as the ds service account. The Document Builder API improperly processes user-controlled converter XML supplied through the optional third argument of builder.SaveFile(). By injecting a duplicate m_sFileTo element, an attacker can override the server-generated output path and write arbitrary content outside the designated job directory. This allows the attacker to overwrite the runtime.json configuration file, modify the Document Builder executable path and arguments, and execute arbitrary commands when a subsequent Document Builder job is processed.