CVE-2021-47934

MEDIUM 5.3

MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-79
Vendor	mybb
Product	mybb timeline plugin
Published	May 16, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

MyBB / MyBB Timeline Plugin

1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

0xB9