What’s Vulnerable › Vulnerabilities
CVE-2025-27791: Collabora Online Vulnerable to Arbitrary File Write
- Severity: high (CVSS 8.3 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.5% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-04-15 · updated 2026-06-17
- Weakness: CWE-23
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.
Affected products
- CollaboraOnline online: from 24.04.1.1, < 24.04.13.1; from 23.05.0, < 23.05.19; before 22.05.25
References
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