What’s Vulnerable › Vulnerabilities

CVE-2021-47934: MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-16 · updated 2026-06-17
• Weakness: CWE-79

Description

MyBB Timeline Plugin 1.0 contains cross-site scripting vulnerabilities that allow attackers to inject malicious scripts through thread titles, post content, and user profile fields like Location and Bio. Attackers can also exploit a cross-site request forgery vulnerability in the timeline.php profile action to change a user's cover picture by crafting malicious forms that execute when victims visit affected profiles.

Affected products

• MyBB Timeline Plugin: 1.0

References

• https://community.mybb.com/mods.php?action=view&pid=1428
• https://www.exploit-db.com/exploits/49467
• https://www.vulncheck.com/advisories/mybb-timeline-plugin-cross-site-scripting-and-csrf

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