What is CVE-2021-47934?

CVE-2021-47934 is a medium-severity vulnerability in Mybb Timeline Plugin, classified under Cross-site Scripting. CVSS score: 5.3/10. Published 2026-05-16.

How severe is CVE-2021-47934?

Medium severity. CVSS v3 base score is 5.3 out of 10.

XSS in Mybb Timeline Plugin

CVE-2021-47934

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-…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (11.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

Affected products

Mybb Timeline Plugin — versions 1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

disclosure@vulncheck.com (exploit)
disclosure@vulncheck.com (product)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2021-47934?: CVE-2021-47934 is a medium-severity vulnerability in Mybb Timeline Plugin, classified under Cross-site Scripting. CVSS score: 5.3/10. Published 2026-05-16.
How severe is CVE-2021-47934?: Medium severity. CVSS v3 base score is 5.3 out of 10.