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fix(sentry): scrub percent-encoded Matrix IDs and opaque base64url tokens from URLs #531

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7w1 merged 2 commits into from
Mar 25, 2026
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fix(sentry): scrub percent-encoded Matrix IDs and opaque base64url tokens from URLs #531

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fix(sentry): scrub percent-encoded Matrix IDs and opaque base64url to…
Just-Insane Mar 25, 2026
6c4804c
Update src/app/utils/sentryScrubbers.ts
Just-Insane Mar 25, 2026
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5 changes: 5 additions & 0 deletions .changeset/sentry-scrub-opaque-matrix-ids.md
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---
default: patch
---

fix(sentry): scrub percent-encoded Matrix IDs and opaque base64url tokens from Sentry URLs
11 changes: 11 additions & 0 deletions src/app/utils/sentryScrubbers.ts
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Expand Up @@ -92,6 +92,17 @@ export function scrubMatrixUrl(url: string): string {
.replace(/\/%23[^/?#\s]*/gi, '/[ROOM_ALIAS]')
// URL-encoded event IDs as bare path segments: /%24eventId (%24 = $)
.replace(/\/%24[^/?#\s]*/gi, '/[EVENT_ID]')
// ── Opaque Matrix IDs with percent-encoded colon (%3A) ─────────────────────────
// Catches device IDs, filter tokens, and other bare Matrix IDs that lack a sigil
// prefix but still follow the localpart%3Aserver pattern in URL paths.
// e.g. /Gj3Wy2D8gAi8jTIyR%3Asable.moe (decoded: Gj3Wy2D8gAi8jTIyR:sable.moe)
.replace(/\/[A-Za-z0-9+_-]{5,}%3A[A-Za-z0-9._-]+[^/?#\s]*/gi, '/[MATRIX_ID]')
// ── Long opaque base64url path segments (access tokens, crypto keys, push tokens) ─
// Catches 30+ character base64url strings that appear as standalone path segments.
// These are typically Curve25519 keys, MSC3575 session tokens, or push endpoints.
// e.g. /vI02CuiDNpaYEhUIVLbqE8vdKqm2ZwqIR5Y6NwNY_Rg/
// Runs last so earlier patterns already replaced known Matrix IDs.
.replace(/\/[A-Za-z0-9+_-]{30,}(\/|$)/g, '/[REDACTED]$1')
// ── Preview URL endpoint ────────────────────────────────────────────────────────
// The ?url= query parameter on preview_url contains the full external URL being
// previewed — strip the entire query string so browsing habits cannot be inferred.
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