Jenkins 2.196 and earlier, LTS 2.176.3 and earlier did not escape the SCM tag name on the tooltip for SCM tag actions, resulting in a stored XSS vulnerability exploitable by users able to control SCM tag names for these actions.
http://www.openwall.com/lists/oss-security/2019/09/25/3
https://jenkins.io/security/advisory/2019-09-25/#SECURITY-1537%20(1)
Source: MITRE
Published: 2019-09-25
Updated: 2019-10-09
Type: CWE-79
Base Score: 3.5
Vector: AV:N/AC:M/Au:S/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 6.8
Severity: LOW
Base Score: 5.4
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Impact Score: 2.7
Exploitability Score: 2.3
Severity: MEDIUM