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TI-2026-19024 Aliases CVE-2026-23623

Collabora Online vulnerable to Authorization Bypass

Priority MEDIUM 63CWE-285Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-285.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00241 15th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
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
CollaboraonlineCollabora 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—No fix listedCNA
  • online VendorCollabora Affected 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 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23623

References

Other 1

  • TI-2026-73868 Collabora Online Built-in CODE Server allows remote code execution KEVCVSS 4.0CRITICAL 9.2
  • 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-2025-20570 Collabora Online Vulnerable to Arbitrary File Write CVSS 4.0HIGH 8.3
  • 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