The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
textview_uri_security_check in textview.c in Claws Mail before 3.18.0, and Sylpheed through 3.7.0, does not have sufficient link checks before accepting a click.
Base Score: 5.8
Impact Score: 4.9
Exploitability Score: 8.6
Base Score: 6.1
Impact Score: 2.7
Exploitability Score: 2.8
cpe:2.3:a:sylpheed_project:sylpheed:*:*:*:*:*:*:*:* versions up to 3.7.0 (inclusive)