XSS can injected in the name of a color of select box values of a tracker and then reflected in the trackers and agile dashboard plugins. While the injection point exists since a while in Tuleap, the exploitation has been made possible with story #11542 and story #11543.
Impact
An attacker could use this vulnerability to force a victim to execute uncontrolled code.
CVSSv3 score: 5.4 (CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N)
Exploitation
As a tracker admin edit the color of a selectbox value and intercept the request to replace the name of the color by a payload like "><script>alert(1)</script> to demonstrate the issue.
References
CWE 79
OWASP Cross-site Scripting