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CVE-2026-35055— XenForo Cross-Site Scripting via Lightbox in Posts

Quick assessment

Affected
XenForo XenForo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Xenforo是Xenforo公司的一个论坛软件。 XenForo 2.3.9之前版本和2.2.18之前版本存在跨站脚本漏洞，该漏洞源于帖子中灯箱使用存在跨站脚本，可能导致攻击者注入恶意脚本。

CVSS 6.1 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 2

VendorProduct Version RangeStatus
XenForo XenForo 2.3.0< 2.3.9 affected
< 2.2.18 affected
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I. Basic Information for CVE-2026-35055

Vulnerability Information
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Vulnerability Title
XenForo Cross-Site Scripting via Lightbox in Posts
Source: CVE Program / CVE List V5
Vulnerability Description
XenForo before 2.3.9 and before 2.2.18 is vulnerable to cross-site scripting (XSS) related to lightbox usage in posts. An attacker can inject malicious scripts that execute when users interact with post content displayed in the lightbox.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Xenforo 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Xenforo是Xenforo公司的一个论坛软件。 XenForo 2.3.9之前版本和2.2.18之前版本存在跨站脚本漏洞，该漏洞源于帖子中灯箱使用存在跨站脚本，可能导致攻击者注入恶意脚本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
XenForo XenForo 2.3.0 ~ 2.3.9 -

II. Public POCs for CVE-2026-35055

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-35055

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Same Patch Batch · XenForo · 2026-04-01 · 10 CVEs total

CVE-2025-71279 9.8 CRITICAL XenForo Passkey Security Bypass
CVE-2025-71281 8.8 HIGH XenForo Template Method Call Restriction Bypass
CVE-2025-71278 8.8 HIGH XenForo OAuth2 Unauthorized Scope Request
CVE-2025-71282 7.5 HIGH XenForo Path Disclosure via open_basedir Exceptions
CVE-2026-35056 7.2 HIGH XenForo Remote Code Execution via Authenticated Admin
CVE-2026-35054 6.4 MEDIUM XenForo Stored Cross-Site Scripting via BB Code Rendering
CVE-2026-35057 6.4 MEDIUM XenForo Stored Cross-Site Scripting via Structured Text Mentions
CVE-2024-58342 6.3 MEDIUM XenForo Open Redirect via getDynamicRedirect
CVE-2025-71280 6.2 MEDIUM XenForo Local Account Page Caching Information Disclosure

IV. Related Vulnerabilities

Same product: XenForo
Same vendor: XenForo
Same weakness: CWE-79