matrix-spec/content/changelog/v1.15.md

---
title: v1.15 Changelog
linkTitle: v1.15
type: docs
layout: changelog
outputs:
  - html
  - checklist
date: 2025-06-26
---

## Client-Server API

**New Endpoints**

- Add `GET /_matrix/client/v1/room_summary/{roomIdOrAlias}`, as per [MSC3266](https://github.com/matrix-org/matrix-spec-proposals/pull/3266). ([#2125](https://github.com/matrix-org/matrix-spec/issues/2125))
- Add `GET /_matrix/client/v1/auth_metadata`, as per [MSC2965](https://github.com/matrix-org/matrix-spec-proposals/pull/2965). ([#2147](https://github.com/matrix-org/matrix-spec/issues/2147))

**Backwards Compatible Changes**

- Add `m.topic` content block to enable rich text in `m.room.topic` events as per [MSC3765](https://github.com/matrix-org/matrix-spec-proposals/pull/3765). ([#2095](https://github.com/matrix-org/matrix-spec/issues/2095))
- Include device keys with Olm-encrypted events as per [MSC4147](https://github.com/matrix-org/matrix-spec-proposals/pull/4147). ([#2122](https://github.com/matrix-org/matrix-spec/issues/2122))
- Add `/_matrix/client/v1/room_summary/{roomIdOrAlias}` and extend `/_matrix/client/v1/rooms/{roomId}/hierarchy` with the new optional properties `allowed_room_ids`, `encryption` and `room_version` as per [MSC3266](https://github.com/matrix-org/matrix-spec-proposals/pull/3266). ([#2125](https://github.com/matrix-org/matrix-spec/issues/2125), [#2158](https://github.com/matrix-org/matrix-spec/issues/2158))
- Add the OAuth 2.0 based authentication API, as per [MSC3861](https://github.com/matrix-org/matrix-spec-proposals/pull/3861) and its sub-proposals. ([#2141](https://github.com/matrix-org/matrix-spec/issues/2141), [#2148](https://github.com/matrix-org/matrix-spec/issues/2148), [#2149](https://github.com/matrix-org/matrix-spec/issues/2149), [#2150](https://github.com/matrix-org/matrix-spec/issues/2150), [#2151](https://github.com/matrix-org/matrix-spec/issues/2151), [#2159](https://github.com/matrix-org/matrix-spec/issues/2159), [#2164](https://github.com/matrix-org/matrix-spec/issues/2164))

**Spec Clarifications**

- Clarify behaviour when the `topic` key of a `m.room.topic` event is absent, null, or empty. ([#2068](https://github.com/matrix-org/matrix-spec/issues/2068))
- Fix the example of the `GET /sync` endpoint and the `m.room.member` example used in several places. ([#2077](https://github.com/matrix-org/matrix-spec/issues/2077))
- Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64. ([#2083](https://github.com/matrix-org/matrix-spec/issues/2083))
- "Public" rooms in profile look-ups are defined through their join rule and history visibility. ([#2101](https://github.com/matrix-org/matrix-spec/issues/2101))
- "Public" rooms in user directory queries are defined through their join rule and history visibility. ([#2102](https://github.com/matrix-org/matrix-spec/issues/2102))
- Rooms published in `/publicRooms` don't necessarily have `public` join rules or `world_readable` history visibility. ([#2104](https://github.com/matrix-org/matrix-spec/issues/2104))
- "Public" rooms with respect to call invites are defined through their join rule. ([#2106](https://github.com/matrix-org/matrix-spec/issues/2106))
- "Public" rooms have no specific meaning with respect to moderation policy lists. ([#2107](https://github.com/matrix-org/matrix-spec/issues/2107))
- "Public" rooms with respect to presence are defined through their join rule. ([#2108](https://github.com/matrix-org/matrix-spec/issues/2108))
- Spaces are subject to the same access mechanisms as rooms. ([#2109](https://github.com/matrix-org/matrix-spec/issues/2109))
- Fix various typos throughout the specification. ([#2121](https://github.com/matrix-org/matrix-spec/issues/2121), [#2144](https://github.com/matrix-org/matrix-spec/issues/2144))
- Clarify that Well-Known URIs are available on the server name's hostname. Contributed by @HarHarLinks. ([#2140](https://github.com/matrix-org/matrix-spec/issues/2140))
- Add missing fields in example for `ExportedSessionData`. ([#2154](https://github.com/matrix-org/matrix-spec/issues/2154))


## Server-Server API

**Backwards Compatible Changes**

- Add `m.topic` content block to enable rich text in `m.room.topic` events as per [MSC3765](https://github.com/matrix-org/matrix-spec-proposals/pull/3765). ([#2095](https://github.com/matrix-org/matrix-spec/issues/2095))
- Extend `/_matrix/federation/v1/hierarchy/{roomId}` with the new optional properties `encryption` and `room_version` as per [MSC3266](https://github.com/matrix-org/matrix-spec-proposals/pull/3266). ([#2125](https://github.com/matrix-org/matrix-spec/issues/2125))

**Spec Clarifications**

- Add a note to the invite endpoints that invites to local users may be received twice over federation if the homeserver is already in the room. ([#2067](https://github.com/matrix-org/matrix-spec/issues/2067))
- Clarify the format of third-party invites, including the fact that identity server public keys can be encoded using standard or URL-safe base64. ([#2083](https://github.com/matrix-org/matrix-spec/issues/2083))
- Clarify that auth event of `content.join_authorised_via_users_server` is only necessary for `m.room.member` with a `membership` of `join`. ([#2100](https://github.com/matrix-org/matrix-spec/issues/2100))
- Rooms published in `/publicRooms` don't necessarily have `public` join rules or `world_readable` history visibility. ([#2104](https://github.com/matrix-org/matrix-spec/issues/2104))
- Fix various typos throughout the specification. ([#2128](https://github.com/matrix-org/matrix-spec/issues/2128))
- Clarify that Well-Known URIs are available on the server name's hostname. Contributed by @HarHarLinks. ([#2140](https://github.com/matrix-org/matrix-spec/issues/2140))


## Application Service API

**Spec Clarifications**

- Clarify in the application service registration schema the `url: null` behaviour. ([#2130](https://github.com/matrix-org/matrix-spec/issues/2130))


## Identity Service API

**Spec Clarifications**

- Clarify that public keys can be encoded using standard or URL-safe base64. ([#2083](https://github.com/matrix-org/matrix-spec/issues/2083))


## Push Gateway API

No significant changes.


## Room Versions

No significant changes.


## Appendices

No significant changes.


## Internal Changes/Tooling

**Spec Clarifications**

- Adjust margins in rendered endpoints. ([#2081](https://github.com/matrix-org/matrix-spec/issues/2081))
- Replace Hugo shortcodes in OpenAPI output. ([#2088](https://github.com/matrix-org/matrix-spec/issues/2088))
- Add [well-known funding manifest urls](https://floss.fund/funding-manifest/) to spec to authorise https://matrix.org/funding.json. Contributed by @HarHarLinks. ([#2115](https://github.com/matrix-org/matrix-spec/issues/2115))
- Fix the historical info box when generating the historical spec in CI. ([#2123](https://github.com/matrix-org/matrix-spec/issues/2123))
- Update the header navigation menu with links to modern matrix.org. Contributed by @HarHarLinks. ([#2137](https://github.com/matrix-org/matrix-spec/issues/2137))