XSS in Mybb Last User Threads
CVE-2018-25250
MyBB Last User's Threads in Profile Plugin 1.2 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by crafting thread subjects with script tags. Attackers can create threads with script payloads in the subject field that execute when users visit the attacker's profile page.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (8.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/44339 (Exploit, VDB Entry, exploit)
- community.mybb.com/mods.php (Permissions Required, Product, product)
- www.vulncheck.com/advisories/mybb-last-user-s-threads-in-profile-plugin-persist… (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2018-25250?
- CVE-2018-25250 is a high-severity vulnerability in Mybb Last User Threads, classified under Cross-site Scripting. CVSS score: 7.2/10. Published 2026-04-04.
- How severe is CVE-2018-25250?
- High severity. CVSS v3 base score is 7.2 out of 10.