CollaboraOnline up to 23.05.20.1/24.04.17.3/25.04.08.2/25.04.7.5 Interface improper authorization

CVSS Meta Temp Score
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CTI Interest Score
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5.2$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in CollaboraOnline Online up to 23.05.20.1/24.04.17.3/25.04.08.2/25.04.7.5. Affected by this vulnerability is an unknown functionality of the component Interface. Executing a manipulation can lead to improper authorization. This vulnerability appears as CVE-2026-23623. The attack may be performed from remote. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in CollaboraOnline Online up to 23.05.20.1/24.04.17.3/25.04.08.2/25.04.7.5. It has been declared as critical. This vulnerability affects an unknown code block of the component Interface. The manipulation with an unknown input leads to a improper authorization vulnerability. The CWE definition for the vulnerability is CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-23623 since 01/14/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1548.002.

Upgrading to version 23.05.20.1, 24.04.17.3 or 25.04.7.5 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 5.3
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authorization
CWE: CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Online 23.05.20.1/24.04.17.3/25.04.7.5

Timelineinfo

01/14/2026 CVE reserved
02/06/2026 +23 days Advisory disclosed
02/06/2026 +0 days VulDB entry created
02/06/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-68v6-r6qq-mmq2
Status: Confirmed

CVE: CVE-2026-23623 (🔒)
GCVE (CVE): GCVE-0-2026-23623
GCVE (VulDB): GCVE-100-344608

Entryinfo

Created: 02/06/2026 07:13
Changes: 02/06/2026 07:13 (65)
Complete: 🔍
Cache ID: 216::103

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