CVE-2026-106469 in Gutenverse Form Plugin
Summary
by MITRE • 10/14/2026
The Gutenverse Form WordPress plugin before 3.0.11 does not sanitize SVG icon markup stored in its form blocks before it is decoded and inserted into the page in the browser, allowing authenticated users with Contributor-level access and above to store malicious SVG that executes JavaScript in the session of any user who views or previews the affected form, such as an administrator reviewing a pending post.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified in Gutenverse Form versions prior to 3.0.11 represents a significant security flaw rooted in insufficient input validation and output encoding mechanisms within the WordPress plugin architecture. Specifically, the application fails to properly sanitize SVG icon markup when it is stored inside form blocks. This lack of sanitization allows for the injection of malicious code that persists until the data is rendered by the client-side browser. The core technical failure lies in the absence of strict filtering rules for Scalable Vector Graphics (SVG) content, which are inherently capable of containing executable scripts such as JavaScript or event handlers like onload attributes. By allowing raw SVG markup to be stored without rigorous validation against a whitelist of safe elements and attributes, the plugin creates an entry point for Cross-Site Scripting attacks that bypass standard WordPress security expectations for lower-privileged users.
The operational impact of this vulnerability is particularly severe due to its reliance on authenticated access with relatively low privilege levels. Unlike many vulnerabilities that require administrator-level credentials or unauthenticated remote execution, this flaw can be exploited by any user holding Contributor-level access and above. In typical WordPress environments, contributors often have the ability to create drafts, submit content for review, or manage specific forms without needing full administrative control. An attacker with these privileges can embed a malicious SVG payload within a form block. When an administrator or another privileged user views or previews this form as part of their routine workflow, such as reviewing pending posts or testing form functionality, the browser parses the unsanitized SVG and executes the embedded JavaScript code. This execution occurs within the security context of the victim's session, effectively granting the attacker the same privileges as the viewing administrator.
This scenario facilitates a stored Cross-Site Scripting attack that can lead to comprehensive account compromise. Once the malicious script is executed in the admin's browser session, it can perform actions such as stealing administrative cookies or authentication tokens, redirecting the user to phishing pages designed to capture credentials, or modifying site settings and content without authorization. The persistence of the payload means that every subsequent view by a privileged user poses a risk, turning routine administrative tasks into vectors for exploitation. This undermines the principle of least privilege within WordPress ecosystems, where lower-level roles are expected to have limited impact on core system integrity if compromised.
From a classification perspective, this vulnerability aligns with CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. The specific mechanism involves the storage of malicious content that is later rendered without proper encoding, fitting the profile of Stored XSS. In terms of adversary tactics and techniques, this exploit maps to MITRE ATT&CK technique T1059, Command and Scripting Interpreter, specifically through JavaScript execution in a browser environment. It also relates to T1078, Valid Accounts, as it leverages legitimate but insufficiently restricted user credentials to gain unauthorized access or perform malicious actions within the application session.
To mitigate this vulnerability, immediate updates to Gutenverse Form version 3.0.11 or later are required, as these versions implement proper sanitization routines for SVG inputs. For organizations unable to update immediately, defensive measures should include restricting file upload capabilities and form block editing permissions strictly to Administrator-level users where possible. Additionally, implementing a Content Security Policy (CSP) that restricts the execution of inline scripts can significantly reduce the impact of such XSS attacks by preventing the browser from executing malicious JavaScript embedded within SVG tags or other elements. Regular security audits focusing on input validation for rich media and markup formats are essential to prevent similar issues in WordPress plugins, ensuring that all user-supplied data is rigorously validated against a strict whitelist before storage and rendering.