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.

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.

The EPSS score is 0.00029.

Exploitation none

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
XenForo XenForo affected
Version Status Constraints
2.3.0 affected < 2.3.9

Configuration 1 [-]

cpe:2.3:a:xenforo:xenforo:*:*:*:*:*:*:*:*

No data.

No data.

Project Subscriptions

Vendors Products
Xenforo Subscribe
Xenforo Subscribe
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 23:45:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

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: 2026-04-01T13:37:39.225Z

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

Link: CVE-2026-35054

cve-icon Vulnrichment

Updated: 2026-04-01T13:37:28.687Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-04-01T18:51:19.460

Link: CVE-2026-35054

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses