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Description

MyBB Recent threads 17.0 contains a persistent cross-site scripting vulnerability that allows attackers to inject malicious scripts by creating threads with crafted subject lines. Attackers can create threads with script tags in the subject parameter to execute arbitrary JavaScript in the browsers of all users viewing the index page.

PUBLISHED Reserved 2026-04-29 | Published 2026-04-29 | Updated 2026-04-30 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
HIGH: 7.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

Problem types

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

17.0
affected

Credits

Perileos finder

References

www.exploit-db.com/exploits/44420 (ExploitDB-44420) exploit

community.mybb.com/mods.php?action=view&pid=191 (Product Reference) product

www.vulncheck.com/...threads-persistent-cross-site-scripting (VulnCheck Advisory: MyBB Recent threads 17.0 Persistent Cross-Site Scripting) third-party-advisory

cve.org (CVE-2018-25309)

nvd.nist.gov (CVE-2018-25309)

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