Jason Woltje b42c86360b fix(#190,#191): fix XSS vulnerabilities in Mermaid and WikiLink rendering ...

CRITICAL SECURITY FIXES for two XSS vulnerabilities

Mermaid XSS Fix (#190):
- Changed securityLevel from "loose" to "strict"
- Disabled htmlLabels to prevent HTML injection
- Blocks script execution and event handlers in SVG output

WikiLink XSS Fix (#191):
- Added alphanumeric whitelist validation for slugs
- Escape HTML entities in title attribute
- Reject slugs with special characters that could break attributes
- Return escaped text for invalid slugs

Security Impact:
- Prevents account takeover via cookie theft
- Blocks malicious script execution in user browsers
- Enforces strict content security for user-provided content

Fixes #190, #191

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2026-02-02 12:05:33 -06:00

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