CVE-2021-47934 - CVE House
Back to Database
Status published Medium CVE-2021-47934

MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-47934

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • 0xB9

References

More from MyBB

View All →
CVE-2020-15139
XSS in MyBB
High 8.8
CVE-2018-25250
MyBB Last User's Threads in Profile Plugin 1.2 Persistent XSS
Medium 5.1
CVE-2018-25249
MyBB My Arcade Plugin 1.3 Persistent XSS via Comment
Medium 5.1
CVE-2018-25248
MyBB Downloads Plugin 2.0.3 Persistent XSS via downloads.php
Medium 5.1
CVE-2018-25247
MyBB Like Plugin 3.0.0 Cross-Site Scripting via User Profiles
Medium 5.1

Affected Vendor

Affected Software

MyBB Timeline Plugin
Vulnerable Versions:
1.0

Timeline

Official Publish: May 16th, 2026
Last Modified: May 18th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Weaknesses (CWE)

CWE-79

MITRE ATT&CK TTPs

T1189 Drive-by Compromise
Initial Access
T1059.007 JavaScript
Execution
T1539 Steal Web Session Cookie
Collection
T1213 Data from Information Repositories
Collection
T1567 Exfiltration Over Web Service
Exfiltration
T1491.001 Defacement
Impact