CVE-2025-48937

matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator

CVSS 4.9 MEDIUMEPSS 0.3%CWE-290

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 4.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

10 Jun 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

matrix-rust-sdk is an implementation of a Matrix client-server library in Rust. matrix-sdk-crypto since version 0.8.0 and up to 0.11.0 does not correctly validate the sender of an encrypted event. Accordingly, a malicious homeserver operator can modify events served to clients, making those events appear to the recipient as if they were sent by another user. This vulnerability is fixed in 0.11.1 and 0.12.0.

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

Affected products

matrix-org · matrix-rust-sdk

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References

https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55 https://github.com/matrix-org/matrix-rust-sdk/commit/56980745b4f27f7dc72ac296e6aa003e5d92a75b https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2