Vulnerability · Published Feb 5, 2026 · Assigned by GitHub_M
CVE-2026-23623Collabora Online vulnerable to Authorization Bypass
Medium 5.3
In plain English
A medium-severity security flaw in online from CollaboraOnline. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 15% of all known vulnerabilities).
Official description
Collabora Online is a collaborative online office suite based on LibreOffice technology. Prior to Collabora Online Development Edition version 25.04.08.2 and prior to Collabora Online versions 23.05.20.1, 24.04.17.3, and 25.04.7.5, a user with view-only rights and no download privileges can obtain a local copy of a shared file. Although there are no corresponding buttons in the interface, pressing Ctrl+Shift+S initiates the file download process. This allows the user to bypass the access restrictions and leads to unauthorized data retrieval. This issue has been patched in Collabora Online Development Edition version 25.04.08.2 and Collabora Online versions 23.05.20.1, 24.04.17.3, and 25.04.7.5.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| CollaboraOnline | online | Collabora Online < 25.04.7.5Collabora Online < 24.04.17.3Collabora Online < 23.05.20.1Collabora Online Development Edition < 25.04.08.2 |
Weakness: CWE-285 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N