{"id":"GHSA-x958-rvg6-956w","revision":null,"records":[{"revision":"529365e9612d42c88145055a269e58fc","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-48937","aliases":[],"title":"matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator","description":"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. 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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.","state":0,"publishedAt":"2025-06-10T16:15:41.67+00:00","modifiedAt":"2026-06-17T09:30:30.947+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N","score":4.9,"severity":"MEDIUM"}],"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"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-48937","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-290"],"productCriteria":[],"sourceDates":{"published":"2025-06-10T16:15:41.670","lastModified":"2026-06-17T09:30:30.947"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2025-48937","identifiers":["CVE-2025-48937"]},"retained":false,"historicalAffected":[]},{"revision":"4df3193fa14943a5ad72721b72719500","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"GHSA-x958-rvg6-956w","aliases":["CVE-2025-48937","RUSTSEC-2025-0041"],"title":"matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator","description":"### Summary\n\nmatrix-sdk-crypto since version 0.8.0 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.\n\nAlthough the CVSS score is 4.9 (AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N), we consider this a High Severity security issue.\n\n### Details\n\nThe Matrix specification [requires](https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2) that clients ensure that \"the event’s `sender`, `room_id`, and the recorded `session_id` match a trusted session\". The vulnerable matrix-sdk-crypto versions check that the `room_id` matches that of the session denoted by `session_id`, but do not check the `sender`.\n\n### Patches\n\nThe issue is resolved by [13c1d20](https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55), included in versions 0.11.1 and 0.12.0 of matrix-sdk-crypto.\n\n### Workarounds\n\nSince a successful attack requires administrator access to the homeserver, users who trust the administrators of their local homeserver are not affected.\n\n### References\n\n * https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2","state":0,"publishedAt":"2025-06-10T20:15:37+00:00","modifiedAt":"2025-06-12T21:23:37+00:00","affected":[{"ecosystem":"crates.io","name":"matrix-sdk-crypto","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.8.0"},{"kind":"fixed","version":"0.11.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w","https://nvd.nist.gov/vuln/detail/CVE-2025-48937","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","https://rustsec.org/advisories/RUSTSEC-2025-0041.html","https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2"],"sourceUrl":"https://github.com/advisories/GHSA-x958-rvg6-956w","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-x958-rvg6-956w","identifiers":["GHSA-x958-rvg6-956w","CVE-2025-48937","RUSTSEC-2025-0041"]},"retained":false,"historicalAffected":[]},{"revision":"b5ce75d90a1b44a080a466c5297bd31b","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2025-0041","aliases":["CVE-2025-48937","GHSA-x958-rvg6-956w"],"title":"matrix-sdk-crypto vulnerable to encrypted event sender spoofing by homeserver administrator","description":"matrix-sdk-crypto versions 0.8.0 up to and including 0.11.0 does not correctly validate\nthe sender of an encrypted event. 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