matrix-sdk-ui: Incomplete edit validation

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-45057
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 21:17:09 UTC
Updated2026-09-11 21:17:09 UTC
Descriptionmatrix-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.

Risk And Classification

Primary CVSS: v3.1 4.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-345 | CWE-345 CWE-345: Insufficient Verification of Data Authenticity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED4.9MEDIUMCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Matrix-org Matrix-sdk-ui affected < 0.16.1 Not specified

References

ReferenceSourceLinkTags
github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1 [email protected] github.com
github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-h97m-27fx... [email protected] github.com
github.com/matrix-org/matrix-rust-sdk/pull/6454 [email protected] github.com
rustsec.org/advisories/RUSTSEC-2026-0158.html [email protected] rustsec.org
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