CVE-2026-8846 eldougo CVE debrief

Who should care

WordPress site administrators using the Tuxquote plugin; security teams managing content management system (CMS) deployments; developers maintaining WordPress plugins with shortcode functionality; organizations with Contributor or Author user roles enabled for non-administrative content creators

Technical summary

The Tuxquote plugin's `tuxquote_build_format()` function directly concatenates user-controlled shortcode attributes into HTML output without passing through WordPress escaping functions `esc_attr()` or `esc_html()`. The vulnerable attributes—`title`, `align`, and `width`—are rendered in the generated markup, allowing script injection. Because this is a stored XSS vulnerability, the malicious payload persists in the database and executes for all users viewing the injected content. The attack requires authenticated access with Contributor capabilities or higher, limiting exposure to insider threats or compromised accounts with elevated privileges. The CVSS 3.1 score of 6.4 reflects network attack vector, low attack complexity, low privileges required, no user interaction, and changed scope with low impacts to confidentiality and integrity.

Defensive priority

medium

Recommended defensive actions

• Upgrade Tuxquote plugin to version 1.4 or later if available; otherwise, disable the plugin until a patch is released
• Review existing posts and pages for unauthorized TUXQUOTE shortcode usage, particularly checking the title, align, and width attributes for suspicious script content
• Implement Content Security Policy (CSP) headers to mitigate impact of any unpatched XSS vectors
• Restrict Contributor and Author role assignments to trusted users only, as these roles can exploit this vulnerability
• Enable WordPress automatic plugin updates or subscribe to security advisories for the Tuxquote plugin to receive timely patch notifications
• Consider using a Web Application Firewall (WAF) rule to filter malicious payloads in shortcode attributes as a temporary defense layer

Evidence notes

Vulnerability confirmed via Wordfence security advisory and WordPress plugin repository source code review. CWE-79 (Improper Neutralization of Input During Web Page Generation) identified as root cause. CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.