CVE-2025-27791: Collabora Online Vulnerable to Arbitrary File Write
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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2025-27791?
CVE-2025-27791 is classified as a high-severity vulnerability due to its potential to allow unauthorized file access.
How do I fix CVE-2025-27791?
To fix CVE-2025-27791, upgrade Collabora Online to versions 24.04.12.4, 23.05.19, or 22.05.25 or later.
What does CVE-2025-27791 affect?
CVE-2025-27791 affects Collabora Online versions prior to 24.04.12.4, 23.05.19, and 22.05.25 due to a path traversal flaw.
What is a path traversal vulnerability in CVE-2025-27791?
A path traversal vulnerability like CVE-2025-27791 allows attackers to access files or directories outside the intended folder structure.
When was CVE-2025-27791 disclosed?
CVE-2025-27791 was disclosed in 2025, specifically highlighting its identified flaw in previous versions of Collabora Online.