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+---
+gem: prosemirror_to_html
+ghsa: vfpf-xmwh-8m65
+url: https://github.com/etaminstudio/prosemirror_to_html/security/advisories/GHSA-52c5-vh7f-26fx
+title: ProsemirrorToHtml has a Cross-Site Scripting (XSS)
+  vulnerability through unescaped HTML attribute values
+date: 2025-11-07
+description: |
+  ### Impact
+
+  The prosemirror_to_html gem is vulnerable to Cross-Site Scripting
+  (XSS) attacks through malicious HTML attribute values. While tag
+  content is properly escaped, attribute values are not, allowing
+  attackers to inject arbitrary JavaScript code.
+
+  **Who is impacted:**
+
+  - Any application using prosemirror_to_html to convert ProseMirror
+    documents to HTML
+  - Applications that process user-generated ProseMirror content are
+    at highest risk
+  - End users viewing the rendered HTML output could have malicious
+   JavaScript executed in their browsers
+
+  **Attack vectors include:**
+
+  - `href` attributes with `javascript:` protocol:
+    `<a href="javascript:alert(document.cookie)">`
+  - Event handlers: `<div onclick="maliciousCode()">`
+  - `onerror` attributes on images: `<img src=x onerror="alert('XSS')">`
+  - Other HTML attributes that can execute JavaScript
+
+  ### Patches
+
+  A fix is currently in development. Users should upgrade to version
+  **0.2.1** or later once released.
+
+  The patch escapes all HTML attribute values using `CGI.escapeHTML`
+  to prevent injection attacks.
+
+  ### Workarounds
+
+  Until a patched version is available, users can implement one or
+  more of these mitigations:
+
+  1. **Sanitize output**: Pass the HTML output through a sanitization
+     library like [Sanitize](https://github.com/rgrove/sanitize) or
+     [Loofah](https://github.com/flavorjones/loofah):
+
+  ```ruby
+     html = ProsemirrorToHtml.render(document)
+     safe_html = Sanitize.fragment(html, Sanitize::Config::RELAXED)
+  ```
+
+  2. **Implement Content Security Policy (CSP)**: Add strict CSP
+     headers to prevent inline JavaScript execution:
+  ```
+     Content-Security-Policy: default-src 'self'; script-src 'self'
+  ```
+
+  3. **Input validation**: If possible, validate and sanitize
+     ProseMirror documents before conversion to prevent malicious
+     content from entering the system.
+
+  ### References
+
+  - Vulnerable code: https://github.com/etaminstudio/prosemirror_to_html/blob/ea8beb32f6c37f29f042ba4155ccf18504da716e/lib/prosemirror_to_html.rb#L249
+  - [OWASP XSS Prevention Cheat Sheet](https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html)
+cvss_v3: 7.6
+patched_versions:
+  - ">= 0.2.1"
+related:
+  url:
+    - https://github.com/etaminstudio/prosemirror_to_html/security/advisories/GHSA-52c5-vh7f-26fx
+    - https://github.com/etaminstudio/prosemirror_to_html/releases/tag/v0.2.1
+    - https://github.com/etaminstudio/prosemirror_to_html/commit/4d59f94f550bcabeec30d298791bbdd883298ad8
+    - https://github.com/etaminstudio/prosemirror_to_html/blob/ea8beb32f6c37f29f042ba4155ccf18504da716e/lib/prosemirror_to_html.rb#L249
+    - https://github.com/rubysec/ruby-advisory-db/blob/master/gems/prosemirror_to_html/GHSA-52c5-vh7f-26fx.yml
+    - https://github.com/advisories/GHSA-vfpf-xmwh-8m65