matrix-org matrix-sdk-ui up to 0.16.0 Message Edit Validation Logic improper authentication

Summaryinfo

A vulnerability described as problematic has been identified in matrix-org matrix-sdk-ui up to 0.16.0. The affected element is an unknown function of the component Message Edit Validation Logic. Executing a manipulation can lead to improper authentication. The identification of this vulnerability is CVE-2026-45057. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in matrix-org matrix-sdk-ui up to 0.16.0. It has been declared as problematic. This vulnerability affects an unknown code block of the component Message Edit Validation Logic. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect integrity. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-45057 since 05/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. The technical details are unknown and an exploit is not available.

Upgrading to version 0.16.1 eliminates this vulnerability.

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Productinfo

Vendor

• matrix-org

Name

• matrix-sdk-ui

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16.0

CPE 2.3info

• 🔒
• 🔒
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CPE 2.2info

• 🔒
• 🔒
• 🔒

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