The ScoreMe theme through 2016-04-01 for WordPress has XSS via the s parameter.
https://wpvulndb.com/vulnerabilities/8431
Source: Mitre, NVD
Published: 2019-09-17
Base Score: 3.5
Vector: CVSS2#AV:N/AC:M/Au:S/C:N/I:P/A:N
Severity: Low
Base Score: 5.4
Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Severity: Medium