CVE-2026-45057
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
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 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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| matrix-org | matrix-sdk-ui | < 0.16.1 | affected |
Weaknesses
- CWE-345: CWE-345: Insufficient Verification of Data Authenticity
References
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-h97m-27fx-42rx
- https://github.com/matrix-org/matrix-rust-sdk/pull/6454
- https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1
- https://rustsec.org/advisories/RUSTSEC-2026-0158.html
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