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.
Published: 2026-05-16
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No vendor fix or workaround currently provided.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

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Advisories

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History

Mon, 18 May 2026 14:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sat, 16 May 2026 15:45:00 +0000

Type Values Removed Values Added
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.
Title MyBB Timeline Plugin 1.0 Cross-Site Scripting and CSRF
First Time appeared Mybb
Mybb mybb
Weaknesses CWE-79
CPEs cpe:2.3:a:mybb:mybb:1.0:*:*:*:*:*:*:*
Vendors & Products Mybb
Mybb mybb
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-05-18T13:43:44.349Z

Reserved: 2026-02-01T11:24:18.717Z

Link: CVE-2021-47934

cve-icon Vulnrichment

Updated: 2026-05-18T13:43:25.517Z

cve-icon NVD

Status : Deferred

Published: 2026-05-16T16:16:21.267

Modified: 2026-06-17T04:18:47.163

Link: CVE-2021-47934

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-05-16T18:15:28Z

Weaknesses