security(sanitization): mitigate mutation XSS by replacing regex-base… - #1812
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…d tag-stripping with DOMPurify
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📝 WalkthroughWalkthroughChangesInput sanitization
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR strengthens sanitization, but its removal metadata can be inaccurate after malicious markup is scrubbed, and maintaining separate configurable sanitization policies may let security behavior drift over time. It is mergeable with owner awareness and follow-up to correct the metadata and align policy ownership. Suggested reviewers: 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR adds DOMPurify, but it uses DOMPurify when escapeHtml is not false. The linked issue identifies the vulnerability when escapeHtml is false, where the implementation still uses regex-based neutralization. Therefore, the required Mutation XSS fix is not demonstrated.
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@lib/security/inputSanitization.ts`:
- Line 115: Update the sanitization flow around purifier.sanitize and
result.removedCharacters so the removal metadata is recalculated from the final
sanitized val, rather than retaining counts computed from the pre-DOMPurify
value.
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lib/security/inputSanitization.ts
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…d tag-stripping with DOMPurify
Pull Request
Description
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Related Issue
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Scope
This PR touches exactly one of the following. If it touches more than
one, split it into separate PRs — multi-scope PRs are the pattern that
introduces inconsistent architecture and will not be reviewed as-is.
lib/cipher/**)app/**,components/**)lib/workers/**,hooks/use*Worker.ts)docs/**,*.md, MDX content)tests/**)Changes Made
Testing
npm testpasses locally.npm run typecheckpasses locally.npm run lintpasses locally.lib/cipher/**file stays at or above 80%.A PR that adds functionality without a corresponding test in the same PR will not be merged. "Will add tests later" is not accepted.
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Description
Addresses a high-risk security issue where the sequential regular expression configurations used inside
sanitizePlainTextcould be bypassed via standard Mutation XSS (mXSS) vectors (#1712).Core Advancements
<img src=x onerror=... >).dompurifyconfigured alongsidejsdomto parse, tokens-validate, and scrub input payloads via strict whitelist checks.Closes #1712
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