CVE-2025-31805 is a Medium-severity (CVSS 6.4, CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N) Stored Cross-Site Scripting (XSS) vulnerability affecting Gutena Kit – Gutenberg Blocks and Templates (WordPress plugin slug: gutena-kit) in versions <= 2.0.7. It allows an authenticated user with at least Contributor access to inject scripts into content that can execute when others view the affected page.

Reference: CVE-2025-31805. Source: Wordfence vulnerability record.

Attack Vectors

The primary attack path is through normal WordPress content workflows where users with Contributor (or higher) privileges can submit or edit content that uses Gutena Kit – Gutenberg Blocks and Templates. An attacker with that level of access can insert malicious script payloads into content fields associated with the plugin’s blocks/templates.

This is particularly relevant for organizations that grant Contributor access to external partners, agencies, interns, freelancers, or a broad internal group (e.g., marketing teams across regions). If any such account is compromised (password reuse, phishing, shared credentials), the attacker may be able to use the same path without needing administrator-level access.

Security Weakness

According to the published advisory, Gutena Kit – Gutenberg Blocks and Templates (through version 2.0.7) is vulnerable due to insufficient input sanitization and output escaping. In practical terms, this means untrusted input can be stored in the database and later rendered to other users in a way that allows scripts to run in their browsers.

There is no known patch available at the time of the referenced report. That increases risk because standard “update to fixed version” guidance may not be an option, requiring business-led decisions on mitigation, replacement, or removal.

Technical or Business Impacts

Account and session risk: When stored XSS executes in a victim’s browser, it can potentially interact with what the victim is doing on the site. If a privileged user (e.g., Editor, Administrator) views the injected page, the attacker may be able to leverage that session to perform actions the victim is authorized to perform.

Brand and customer trust: Malicious scripts can be used to redirect visitors, inject fraudulent forms, or display unauthorized content. For marketing and customer-facing sites, this can directly impact campaign performance, lead integrity, and brand credibility.

Compliance and reporting exposure: If the attack results in unauthorized access or data exposure (even limited), it can trigger internal incident response, contractual reporting requirements, or regulatory considerations depending on your industry and geography.

Operational disruption: Responding to a stored XSS incident often includes emergency content audits, user account reviews, forced password resets, and potentially taking pages (or the site) temporarily offline—disrupting marketing calendars and revenue-generating funnels.

Suggested mitigations (risk-based): Since no patch is currently known, consider (1) uninstalling Gutena Kit – Gutenberg Blocks and Templates and replacing it with a supported alternative, (2) limiting who has Contributor or higher access, (3) reviewing recent content changes and blocks/templates for suspicious insertions, (4) enabling strong authentication controls (unique passwords, MFA where possible), and (5) increasing monitoring for unexpected admin actions and content edits.

Similar Attacks

Stored XSS has been used historically to spread rapidly and impact large user populations:

MySpace “Samy” worm (2005) — a classic example of stored XSS used to self-propagate across user profiles.
Twitter onMouseOver worm (2010) — demonstrated how injected scripts could automatically spread and cause widespread user impact.