CVE-2026-45057matrix-sdk-ui: Incomplete edit validation
Updated under an hour ago ()
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It affects matrix-org matrix-sdk-ui. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 4.9 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
- Weakness (CWE)
- CWE-345
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Deferred
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
matrix-org matrix-sdk-ui matrix_org:matrix_sdk_ui (from the name) | before 0.16.1 | CNA record |
References
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-h97m-27fx-42rxx-refsource-confirm
- https://github.com/matrix-org/matrix-rust-sdk/pull/6454x-refsource-misc
- https://github.com/matrix-org/matrix-rust-sdk/releases/tag/matrix-sdk-0.16.1x-refsource-misc
- https://rustsec.org/advisories/RUSTSEC-2026-0158.htmlx-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.