---
id: CVE-2026-45057
title: matrix-sdk-ui provides GUI-centric utilities on top of matrix-rust-sdk
summary: >-
  matrix-sdk-ui provides GUI-centric utilities on top of matrix-rust-sdk. The
  message edit validation logic in the  `matrix-sdk-ui` crate prior to 0.17.0 is
  missing a check: when replacing an encrypted event, the replacement event
  itself i…
severity: medium
cvss: 4.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-345
vendor: matrix-org
product: matrix-sdk-ui
affected:
  - matrix-sdk-ui < 0.16.1
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T17:17:44.573'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-45057'
references:
  - url: 'https://github.com/matrix-org/matrix-rust-sdk/pull/6454'
    label: security-advisories@github.com
  - url: >-
      https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1
    label: security-advisories@github.com
  - url: >-
      https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-h97m-27fx-42rx
    label: security-advisories@github.com
  - url: 'https://rustsec.org/advisories/RUSTSEC-2026-0158.html'
    label: security-advisories@github.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45057.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-45057'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-45057'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T16:16:05.439558Z'
epss: 0.00233
epssPercentile: 0.12648
ingestedAt: '2026-09-14T11:11:19.877Z'
---

## Overview

matrix-sdk-ui provides GUI-centric utilities on top of matrix-rust-sdk. The message edit validation logic in the  `matrix-sdk-ui` crate prior to 0.17.0 is missing a check: when replacing an encrypted event, the replacement event itself is not required to be encrypted. This enables a malicious homeserver administrators (or actors with equivalent power) to impersonate or spoof messages as if they were sent by a victim user. `matrix-sdk-ui` 0.17.0 fixes the message edit validation logic to align with the algorithm for replacement events[^1] described in the Matrix specification. No known workarounds are available.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45057.json)