CVE-2025-27791 Collabora Online Vulnerable to Arbitrary File Write
A path traversal flaw in Collabora Online allows arbitrary file writes via malicious WOPI server responses, potentially leading to code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-27791?
CVE-2025-27791 is a high-severity path traversal vulnerability in CollaboraOnline online, published on 15 Apr 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Collabora Online is a collaborative online office suite based on LibreOffice technology. In versions prior to 24.04.12.4, 23.05.19, and 22.05.25, there is a path traversal flaw in handling the CheckFileInfo BaseFileName field returned from WOPI servers. This allows for a file to be written anywhere the uid running Collabora Online can write, if such a response was supplied by a malicious WOPI server. By combining this flaw with a Time of Check, Time of Use DNS lookup issue with a WOPI server address under attacker control, it is possible to present such a response to be processed by a Collabora Online instance. This issue has been patched in versions 24.04.13.1, 23.05.19, and 22.05.25.
Weakness: CWE-23
Which versions are affected by CVE-2025-27791?
How do I fix CVE-2025-27791?
No fix has been published for CVE-2025-27791 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-2025-27791 being exploited?
There is no known exploitation of CVE-2025-27791 in the wild and no public exploit code.
Sources
Also known as GHSA-9j32-gg3j-8w25.