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CVE-2026-45057— matrix-sdk-ui: Incomplete edit validation

Quick assessment

Affected
matrix-org matrix-sdk-ui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 之上提供了以图形用户界面（GUI）为中心的工具集。在版本 0.17.0 之前， crate 中的消息编辑校验逻辑存在一个缺失的检查项：当替换一个加密事件时，被用来替换的“新事件”本身并未被要求必须是加密的。这一缺陷使得恶意的 homeserver 管理员（或拥有同等权限的角色）能够冒充或伪造消息，使其看起来像是由受害用户发送的。 0.17.0 版本修复了消息编辑的校验逻辑，使其与 Matrix 规范中关于替换事件[^1]的算法保持一致。目前尚未发现可用的变通方案。

CVSS 4.9 · Medium EPSS 0.02% · P5
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I. Basic Information for CVE-2026-45057

Vulnerability Information
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Vulnerability Title
matrix-sdk-ui: Incomplete edit validation
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
matrix-org matrix-sdk-ui < 0.16.1 -

II. Public POCs for CVE-2026-45057

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III. Intelligence Information for CVE-2026-45057

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Patches & Fixes for CVE-2026-45057 (2)

Vendor Advisories for CVE-2026-45057 (2)

IV. Related Vulnerabilities

Same vendor: matrix-org
Same weakness: CWE-345

V. Comments for CVE-2026-45057

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