Is CVE-2026-35055 actively exploited?

CVE-2026-35055 has no public evidence of in-the-wild exploitation as of 2026-04-01.

What is the CVSS score for CVE-2026-35055?

CVE-2026-35055 has a CVSS score of 5.1 (MEDIUM severity). Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-35055?

Patch guidance is available from xenforo security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-35055.

Which products are affected by CVE-2026-35055?

2 products: xenforo xenforo, xenforo xenforo.

CVE-2026-35055 - remediation guidance & executive summary

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.

CVSS Metrics

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: none
User Action: active
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-79 · Cross-site Scripting (XSS)

Metadata

Primary Vendor: XENFORO
Published: 4/1/2026
Last Modified: 4/1/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

xenforo : xenforoxenforo : xenforo

Remediation Guidance

Executive Summary

Cite this page

CVE-2026-35055. CVEDatabase.com. Retrieved 1 May 2026. https://cvedatabase.com/cve/CVE-2026-35055

View on NIST NVD

CVE-2026-35055 vulnerability