What’s Vulnerable › Vulnerabilities

CVE-2018-25309: MyBB Recent threads 17.0 Persistent Cross-Site Scripting

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-29 · updated 2026-06-17
• Weakness: CWE-79

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.

Affected products

• MyBB Recent threads: 17.0

References

• https://community.mybb.com/mods.php?action=view&pid=191
• https://www.exploit-db.com/exploits/44420
• https://www.vulncheck.com/advisories/mybb-recent-threads-persistent-cross-site-scripting

Get alerted when CVE-2018-25309 or the next vulnerability affects your stack