Security fix · CVE-2026-23623
Collabora Online is a collaborative online office suite based on LibreOffice technology.
Published Feb 5, 2026 · catalog updated Feb 6, 2026 · CollaboraOnline
Last checked Nov 4, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2026-23623. EPSS is 0.24%. Act only if a listed version of CollaboraOnline is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
Same product and reporting
- CVE-2025-27791 · High
- Severity
- Medium5.3
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.24%
- Remediation
- Version ranges on file
- Affected products
- vendor CollaboraOnline online Collabora Online Development Edition < 25.04.08.2
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 Deve
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor CollaboraOnline online Collabora Online Development Edition < 25.04.08.2Collabora Online Development Edition < 25.04.08.2
How to fix CVE-2026-23623
Upgrade
CVE-2026-23623 lists a fix boundary at 25.04.08.2. Compare the installed build with that boundary before you change production.
Version check
Seen in Collabora Online Development Edition < 25.04.08.2
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2026-23623. EPSS is 0.24%. Act only if a listed version of CollaboraOnline is installed.
Which versions are affected?
Compare what you have installed with CollaboraOnline online Collabora Online Development Edition < 25.04.08.2 Collabora Online Development Edition < 25.04.08.2. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.24%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Feb 5, 2026 · EUVD
Detected
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
Feb 6, 2026 · EUVD
Updated
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
Sources
- CVE.orgVulnerability recordCVE-2026-23623
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-23623
30-day exploitation probability 0.24%
first.org - EUVDVulnerability recordEUVD-2026-5608
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 pri
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 4, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 4, 2026
- CVE.orgNov 4, 2026
- EUVDNov 3, 2026