CVE-2025-46236 Overview
CVE-2025-46236 is a stored Cross-Site Scripting (XSS) vulnerability in the Link Software LLC HTML Forms plugin for WordPress. The flaw affects all versions of the plugin up to and including 1.5.2. An authenticated attacker with low privileges can inject malicious script content that is stored by the application and later rendered in the browsers of other users. Successful exploitation requires user interaction to trigger the payload. The issue is tracked under [CWE-79] and stems from improper neutralization of user-supplied input during web page generation.
Critical Impact
Attackers can persist arbitrary JavaScript in HTML Forms plugin data, enabling session hijacking, credential theft, and administrative account compromise when victims view affected pages.
Affected Products
- Link Software LLC HTML Forms (html-forms) WordPress plugin
- All versions from initial release through 1.5.2
- WordPress sites with the plugin installed and accessible to contributor-level or higher accounts
Discovery Timeline
- 2025-04-22 - CVE-2025-46236 published to the National Vulnerability Database
- 2026-06-17 - Last updated in NVD database
Technical Details for CVE-2025-46236
Vulnerability Analysis
The vulnerability is a stored XSS flaw in the HTML Forms WordPress plugin. HTML Forms accepts input from authenticated users but fails to properly sanitize or encode that input before persisting it and rendering it back in the WordPress admin or public-facing pages. When another user loads the affected page, the browser executes the injected script within the context of the victim's session.
The attack requires low privileges and user interaction, and the scope is changed. This means the injected script can affect resources beyond the vulnerable component itself, such as the WordPress administrative interface. Confidentiality and integrity impacts are limited, and there is no direct availability impact. The EPSS probability reported for this issue reflects a low near-term likelihood of mass exploitation.
Root Cause
The root cause is improper neutralization of input during web page generation, classified as [CWE-79]. The plugin trusts input fields associated with form configuration or submitted content and writes them into HTML output without contextual encoding or allowlist-based sanitization. As a result, HTML tags and JavaScript payloads submitted by an authenticated user are preserved verbatim and rendered as active markup.
Attack Vector
Exploitation is performed over the network by an authenticated user with at least contributor-level privileges. The attacker submits a crafted payload through a form configuration field or a stored input processed by the plugin. When a privileged user, such as an administrator, subsequently views the page containing the stored payload, the browser executes the attacker's JavaScript. This can be used to hijack sessions, perform actions on behalf of the victim, or pivot to broader site compromise. Refer to the Patchstack XSS Vulnerability Advisory for the technical writeup.
Detection Methods for CVE-2025-46236
Indicators of Compromise
- Unexpected <script>, <iframe>, or event-handler attributes (onerror, onload, onmouseover) stored in HTML Forms plugin database rows.
- Outbound requests from administrator browser sessions to unfamiliar domains after visiting the WordPress admin dashboard.
- New administrative accounts or unexpected changes to user roles following admin visits to plugin-managed pages.
- Anomalous session cookie exfiltration patterns in web server or proxy logs originating from /wp-admin/ pages.
Detection Strategies
- Audit HTML Forms database entries and post metadata for HTML or JavaScript content that should contain only plain text.
- Deploy a Web Application Firewall (WAF) rule to inspect form submissions for script tags and JavaScript event handlers targeting the plugin endpoints.
- Enable Content Security Policy (CSP) reporting to surface script executions from unexpected origins on WordPress pages.
Monitoring Recommendations
- Monitor WordPress audit logs for form creation and modification events performed by low-privileged users.
- Track HTTP responses containing HTML Forms output for reflected script content and unusual attribute values.
- Alert on administrator session activity that follows shortly after contributor-level content changes involving the plugin.
How to Mitigate CVE-2025-46236
Immediate Actions Required
- Update the HTML Forms plugin to a version later than 1.5.2 as soon as the vendor publishes a fixed release.
- Restrict contributor and author account creation and review existing low-privileged accounts for legitimacy.
- Audit any pages managed by HTML Forms for stored payloads and remove malicious entries before restoring access.
Patch Information
At the time of publication, the vulnerability affects HTML Forms through version 1.5.2. Site owners should consult the Patchstack XSS Vulnerability Advisory and the plugin repository for the latest patched release and apply it across all environments.
Workarounds
- Deactivate the HTML Forms plugin until a patched version is available and verified.
- Enforce a strict Content Security Policy that disallows inline scripts on WordPress admin and public pages rendering plugin output.
- Limit form-editing privileges to trusted administrator accounts using role-management controls.
- Deploy a WAF ruleset that blocks HTML and JavaScript payloads in form fields processed by the plugin.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.