CVE-2026-110385 Path traversal in Document Server
Authenticated attackers can execute arbitrary OS commands by exploiting path traversal in the Document Builder API to overwrite configuration files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-110385?
CVE-2026-110385 is a high-severity path traversal vulnerability in ONLYOFFICE Document Server, published on 14 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-73
Which versions are affected by CVE-2026-110385?
How do I fix CVE-2026-110385?
No fix has been published for CVE-2026-110385 yet. Limit exposure of the affected software until one is available.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-110385 being exploited?
There is no known exploitation of CVE-2026-110385 in the wild and no public exploit code.
Sources
Also known as GHSA-4j4f-mq3p-mc2r.