CVE-2018-25249

MyBB My Arcade Plugin 1.3 Persistent XSS via Comment

MEDIUM 5.1EPSS 0.3%

MyBB My Arcade Plugin 1.3 contains a persistent cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through arcade game score comments. Attackers can add crafted HTML and JavaScript payloads in the comment field that execute when other users view or edit the comment.

Affected: MyBB · MyBB My Arcade Plugin
CVSS v4.0 VULNCHECK: 5.1 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS v3.1 VULNCHECK: 6.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS: 0.25% chance of exploitation in the next 30 days, 16th percentile
Published: 2026-04-04
Updated: 2026-05-24

Proof-of-concept exploits (1)

https://www.exploit-db.com/exploits/44186

Security advisories

https://www.vulncheck.com/advisories/mybb-my-arcade-plugin-persistent-xss-via-comment
https://community.mybb.com/mods.php?action=view&pid=411

References

CVE Record
NVD entry