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TI-2025-20570 Aliases CVE-2025-27791

Collabora Online Vulnerable to Arbitrary File Write

Priority LOW 37CWE-23Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00487 42nd percentileScored 2026-11-08
Fix Fixed online (CollaboraOnline): 24.04.13.1, 23.05.19, 22.05.25

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Collaboraonline24.04.1.1 to before 24.04.13.1; 23.05.0 to before 23.05.19; before 22.05.2524.04.13.1, 23.05.19, 22.05.25Patch availableCNA
  • online VendorCollabora Affected 24.04.1.1 to before 24.04.13.1; 23.05.0 to before 23.05.19; before 22.05.25 Fixed in 24.04.13.1, 23.05.19, 22.05.25 Patch available CNA

Remediation

  • Fix · CNA online (CollaboraOnline) Fixed in 24.04.13.1, 23.05.19, 22.05.25

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-27791

References

Other 1

  • TI-2026-73868 Collabora Online Built-in CODE Server allows remote code execution KEVCVSS 4.0CRITICAL 9.2
  • TI-2026-19024 Collabora Online vulnerable to Authorization Bypass CVSS 3.1MEDIUM 5.3
  • TI-2021-12412 Unauthenticated attacker could gain access to currently open files CVSS 3.1CRITICAL 9.8
  • TI-2025-40711 Configuration-Dependent RCE (OS Command Injection) in richdocumentscode proxy CVSS 4.0HIGH 7.2
  • TI-2023-16934 Collabora Online has Stored Cross-Site-Scripting vulnerability in admin interface CVSS 3.1HIGH 8.7
  • TI-2021-19623 Reflected Cross-Site-Scripting vulnerability in Collabora Online CVSS 3.1HIGH 8.2
See all 19 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences