CVE-2025-27791: collaboraonline online Relative Path Traversal

Vulnerability summary

CVE-2025-27791 is a high (CVSS 8.3) Relative Path Traversal vulnerability in collaboraonline online. EPSS estimates a 0.48% chance of exploitation in the next 30 days, higher than 39.9% of scored vulnerabilities.

Timeline

1. 15-04-2025
   PublishedVulnerability first disclosed.
2. 15-04-2025
   Last modifiedVulnerability information updated.

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.

• CWE-23Relative Path TraversalThe product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize sequences such as ".." that can resolve to a location that is outside of that directory.