XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction Passive

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact Low

Subsequent System Integrity Impact Low

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Changed

Confidentiality Impact Low

Integrity Impact Low

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Xenforo Subscribe
Xenforo Subscribe

No data.

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://www.vulncheck.com/advisories/xenforo-stored-cross-site-scripting-via-bb-code-rendering cve-icon cve-icon
https://xenforo.com/community/threads/xenforo-2-3-9-inc-xfmg-2-2-18-released-security-fix.235659/ cve-icon cve-icon
History

Wed, 01 Apr 2026 02:15:00 +0000

Type Values Removed Values Added
Description XenForo before 2.3.9 is vulnerable to stored cross-site scripting (XSS) related to BB code rendering. An attacker can inject malicious scripts through BB code that are stored and executed when other users view the content.
Title XenForo Stored Cross-Site Scripting via BB Code Rendering
First Time appeared Xenforo
Xenforo xenforo
Weaknesses CWE-79
CPEs cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*
Vendors & Products Xenforo
Xenforo xenforo
References
Metrics cvssV3_1

{'score': 6.4, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-04-01T01:43:23.018Z

Reserved: 2026-04-01T00:19:59.194Z

Link: CVE-2026-35054

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-04-01T01:16:41.200

Modified: 2026-04-01T01:16:41.200

Link: CVE-2026-35054

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses