A security vulnerability was recently identified and fixed in Elements Spreadsheet. Here are the details about the issue, its impact and the analysis and actions taken.

Nature of the issue

The vulnerability affected version 1.4.57-AC of Elements Spreadsheet.
The vulnerability meant that someone could modify the payload of a request to inject runnable JavaScript in URL that would then execute in the browser on the next display of the spreadsheet.
This vulnerability has been rated as medium, according to the scale published on the Common Vulnerability Scoring System (CVSS).
The vulnerability was brought to our notice by the Bug Bounty Program on  .

Impact

Based on our investigations, the vulnerability has not been exploited.

Analysis and actions taken

Once we became aware of the issue, we first confirmed that we could reproduce it. A plan was then elaborated by the IT team to analyse the situation, bring a fix for the issue and deploy it as quickly as possible.
Our investigations revealed that the problem was caused by the acceptance of HTML language in a certain URL parameter.

We added a strict sanitization of this parameter value to prevent a wide range of XSS attacks.

Deployment of the fixed version was conducted by following the usual CI procedure on  .
On top of the automatic tests, we made another series of tests to ensure that the problem was fixed in production.

Conclusion

We want you to know that we take this issue very seriously. We are conducting a thorough review of our internal processes to ensure this does not occur again for our customers.
If you have any questions, please feel free to raise a support request at support.elements-apps.com referencing "SSC-2423".