CVE-2026-23623 Collabora Online vulnerable to Authorization Bypass
Users with view-only rights can bypass download restrictions using a keyboard shortcut to retrieve local copies of shared files.
- 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-2026-23623?
CVE-2026-23623 is a medium-severity missing authorization vulnerability in CollaboraOnline online, published on 5 Feb 2026. 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. 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.
Weakness: CWE-285
Which versions are affected by CVE-2026-23623?
How do I fix CVE-2026-23623?
No fix has been published for CVE-2026-23623 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-23623 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-23623 exists.
Sources
Also known as GHSA-68v6-r6qq-mmq2.