inc/plugins/thankyoulike.php in the Eldenroot Thank You/Like plugin before 3.1.0 for MyBB allows XSS via a post or thread subject.
https://github.com/mybbgroup/MyBB_Thank-you-like-plugin/pull/199
https://www.exploit-db.com/exploits/45178/
https://community.mybb.com/mods.php?action=changelog&pid=360
http://packetstormsecurity.com/files/148871/MyBB-Thank-You-Like-3.0.0-Cross-Site-Scripting.html
Source: Mitre, NVD
Published: 2018-08-14
Updated: 2026-06-17
Base Score: 4.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N
Severity: Medium
Base Score: 6.1
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS: 0.07918