Collabora Online up to 4.2.19/6.4.15 Authentication Token cross site scripting

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
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A vulnerability was found in Collabora Online up to 4.2.19/6.4.15. It has been declared as problematic. This vulnerability affects an unknown code of the component Authentication Token Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity.

The weakness was published 12/14/2021 as GHSA-7f6h-v9mx-58q9. The advisory is shared for download at This vulnerability was named CVE-2021-43817 since 11/16/2021. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007.

Upgrading to version 4.2.20 or 6.4.16 eliminates this vulnerability.



CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (GitHub, Inc.): 🔍



VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍


Class: Cross site scripting
CWE: CWE-79 / CWE-74 / CWE-707
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍


Threat Intelligenceinfo

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


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Collabora Online 4.2.20/6.4.16


11/16/2021 🔍
12/14/2021 +28 days 🔍
12/14/2021 +0 days 🔍
12/16/2021 +2 days 🔍


Advisory: GHSA-7f6h-v9mx-58q9
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-43817 (🔍)


Created: 12/14/2021 08:11 AM
Updated: 12/16/2021 12:09 PM
Changes: 12/14/2021 08:11 AM (49), 12/16/2021 12:01 PM (2), 12/16/2021 12:09 PM (1)
Complete: 🔍


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