CVE-2026-23623: Collabora Online vulnerable to Authorization Bypass

Medium severity · published Feb 5, 2026

CVE-2026-23623

Collabora Online vulnerable to Authorization Bypass

5.3

CVSS

0.2%

EPSS

On KEV

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Attack vector

Network

Complexity

Low

Privileges

None

User interaction

None

Confidentiality

Low

Integrity

None

Availability

None

Scope

Unchanged

Exploitation

Is it being used?

Exploit prediction (EPSS)0.2% · higher than 15% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

online · CollaboraOnline

Collabora Online < 25.04.7.5; Collabora Online < 24.04.17.3; Collabora Online < 23.05.20.1; Collabora Online Development Edition < 25.04.08.2 · source: vendor

Affected product

online

CollaboraOnline

All online CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2026-23623

CVE.org

https://www.cve.org/CVERecord?id=CVE-2026-23623

github.com

https://github.com/CollaboraOnline/online/security/advisories/GHSA-68v6-r6qq-mmq2