---
title: v1.19 Changelog
linkTitle: v1.19
type: docs
layout: changelog
outputs:
  - html
  - checklist
date: 2026-07-08
---

## Client-Server API

**New Endpoints**

- Add `GET /_matrix/client/v1/mutual_rooms`, as per [MSC2666](https://github.com/matrix-org/matrix-spec-proposals/pull/2666). ([#2367](https://github.com/matrix-org/matrix-spec/issues/2367))

**Backwards Compatible Changes**

- Specify `unsigned.replaces_state` in client-formatted events. Contributed by @nexy7574. ([#2345](https://github.com/matrix-org/matrix-spec/issues/2345), [#2403](https://github.com/matrix-org/matrix-spec/issues/2403))
- Specify `m.key_backup` account data, as per [MSC4287](https://github.com/matrix-org/matrix-spec-proposals/pull/4287). ([#2354](https://github.com/matrix-org/matrix-spec/issues/2354))
- The room directory now returns rooms in a server-defined order rather than largest first, as per [MSC4423](https://github.com/matrix-org/matrix-spec-proposals/pull/4423). ([#2392](https://github.com/matrix-org/matrix-spec/issues/2392))
- Add support for image packs (`m.room.image_pack` and `m.image_pack.rooms`), allowing custom emoticons and stickers to be organised into packs and shared between users, as per [MSC2545](https://github.com/matrix-org/matrix-spec-proposals/pull/2545). ([#2397](https://github.com/matrix-org/matrix-spec/issues/2397))
- Specify encrypted history sharing, as per [MSC4268](https://github.com/matrix-org/matrix-spec-proposals/pull/4268). ([#2399](https://github.com/matrix-org/matrix-spec/issues/2399))

**Spec Clarifications**

- Clarify SAS commitment calculation for `m.key.verification.accept` messages. ([#2344](https://github.com/matrix-org/matrix-spec/issues/2344))
- Clarify formats of string types. ([#2347](https://github.com/matrix-org/matrix-spec/issues/2347), [#2349](https://github.com/matrix-org/matrix-spec/issues/2349), [#2358](https://github.com/matrix-org/matrix-spec/issues/2358), [#2359](https://github.com/matrix-org/matrix-spec/issues/2359), [#2370](https://github.com/matrix-org/matrix-spec/issues/2370), [#2374](https://github.com/matrix-org/matrix-spec/issues/2374), [#2375](https://github.com/matrix-org/matrix-spec/issues/2375), [#2376](https://github.com/matrix-org/matrix-spec/issues/2376))
- Restore alphabetical order of common error codes. ([#2348](https://github.com/matrix-org/matrix-spec/issues/2348))
- Fix various typos throughout the specification. ([#2351](https://github.com/matrix-org/matrix-spec/issues/2351), [#2389](https://github.com/matrix-org/matrix-spec/issues/2389))
- Clarify how to find `via` parameter when following room upgrades. ([#2352](https://github.com/matrix-org/matrix-spec/issues/2352))
- Clarify that room messages can be encrypted. ([#2371](https://github.com/matrix-org/matrix-spec/issues/2371))
- Clarify how to paginate messages using the pagination tokens returned by `GET /rooms/{roomId}/context/{eventId}`. ([#2372](https://github.com/matrix-org/matrix-spec/issues/2372))
- Clarify allowed characters in `mxc://` URIs. ([#2377](https://github.com/matrix-org/matrix-spec/issues/2377))
- Add link to RFC 9700 OAuth 2.0 Best Current Practices. ([#2379](https://github.com/matrix-org/matrix-spec/issues/2379))
- Add links from the Client-Server spec to the Olm message definitions. ([#2381](https://github.com/matrix-org/matrix-spec/issues/2381))
- Disambiguate placeholder descriptions in OlmPayload example. ([#2382](https://github.com/matrix-org/matrix-spec/issues/2382))
- Replace "Olm message" with "event encrypted using Olm" where not referring to the Olm message format. ([#2383](https://github.com/matrix-org/matrix-spec/issues/2383))
- Removed unused components in OpenAPI definitions. ([#2386](https://github.com/matrix-org/matrix-spec/issues/2386))
- Clarify definitions of `EncryptedFile` structure. ([#2398](https://github.com/matrix-org/matrix-spec/issues/2398))


## Server-Server API

**Backwards Compatible Changes**

- The room directory now returns rooms in a server-defined order rather than largest first, as per [MSC4423](https://github.com/matrix-org/matrix-spec-proposals/pull/4423). ([#2392](https://github.com/matrix-org/matrix-spec/issues/2392))

**Spec Clarifications**

- Clarify the behaviour and response format of `GET /_matrix/federation/v1/query/profile`. ([#2326](https://github.com/matrix-org/matrix-spec/issues/2326))
- Clarify that server ACLs are case-insensitive, as per [MSC4436](https://github.com/matrix-org/matrix-spec-proposals/pull/4436). ([#2334](https://github.com/matrix-org/matrix-spec/issues/2334))
- Clarify how multiple signatures should be handled during signature verification. Contributed by @nexy7574. ([#2341](https://github.com/matrix-org/matrix-spec/issues/2341))
- Fix various typos throughout the specification. ([#2351](https://github.com/matrix-org/matrix-spec/issues/2351))
- Clarify that policy servers might share a name with event origins, and that servers should avoid overwriting/discarding signatures for the event origin when getting a policy server signature. ([#2385](https://github.com/matrix-org/matrix-spec/issues/2385))


## Application Service API

**Spec Clarifications**

- Fix various typos throughout the specification. ([#2351](https://github.com/matrix-org/matrix-spec/issues/2351))


## Identity Service API

**Spec Clarifications**

- Fix various typos throughout the specification. ([#2401](https://github.com/matrix-org/matrix-spec/issues/2401))


## Push Gateway API

No significant changes.


## Room Versions

**Spec Clarifications**

- Fix various typos throughout the specification. ([#2351](https://github.com/matrix-org/matrix-spec/issues/2351), [#2401](https://github.com/matrix-org/matrix-spec/issues/2401))


## Olm & Megolm

**Spec Clarifications**

- Update links to Olm in the Megolm section to point to the Matrix spec. ([#2361](https://github.com/matrix-org/matrix-spec/issues/2361))
- Fix various typos throughout the specification. ([#2369](https://github.com/matrix-org/matrix-spec/issues/2369))
- Update link from whispersystems.org to signal.org in the olm documentation. ([#2387](https://github.com/matrix-org/matrix-spec/issues/2387))


## Appendices

**Spec Clarifications**

- Update the canonical JSON grammar with case sensitive strings and ABNF builtins to be easier to understand. ([#2368](https://github.com/matrix-org/matrix-spec/issues/2368))
- Fix various typos throughout the specification. ([#2369](https://github.com/matrix-org/matrix-spec/issues/2369))
- Clarify matrix.to RFC 3986 percent encoding requirements. Contributed by @HarHarLinks. ([#2395](https://github.com/matrix-org/matrix-spec/issues/2395))
- Add specification of URL-safe unpadded Base64. ([#2398](https://github.com/matrix-org/matrix-spec/issues/2398))


## Internal Changes/Tooling

**Backwards Compatible Changes**

- Add page search widget. ([#2331](https://github.com/matrix-org/matrix-spec/issues/2331))

**Spec Clarifications**

- Update and fix GitHub Actions. ([#2343](https://github.com/matrix-org/matrix-spec/issues/2343), [#2369](https://github.com/matrix-org/matrix-spec/issues/2369))
- Upgrade Docsy theme to v0.14.3. ([#2346](https://github.com/matrix-org/matrix-spec/issues/2346))
- Configure a new changelog section for the Olm & Megolm specs. ([#2364](https://github.com/matrix-org/matrix-spec/issues/2364))
- Clarify use of UK vs US English in documentation style doc. ([#2366](https://github.com/matrix-org/matrix-spec/issues/2366))
- Ignore typos in copyright statements. ([#2373](https://github.com/matrix-org/matrix-spec/issues/2373))
- Update CODEOWNERS file. ([#2400](https://github.com/matrix-org/matrix-spec/issues/2400))
- Minor fixes to `check-newsfragments` CI script. ([#2402](https://github.com/matrix-org/matrix-spec/issues/2402))
