GHSA-x958-rvg6-956w
Suggest an improvement- Source
- https://github.com/advisories/GHSA-x958-rvg6-956w
- Import Source
- https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2025/06/GHSA-x958-rvg6-956w/GHSA-x958-rvg6-956w.json
- JSON Data
- https://api.osv.dev/v1/vulns/GHSA-x958-rvg6-956w
- Aliases
- Published
- 2025-06-10T20:15:37Z
- Modified
- 2025-06-12T21:23:37Z
- Severity
-
- 4.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- Summary
- matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator
- Details
-
Summary
matrix-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.
Although 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.
Details
The Matrix specification requires that clients ensure that "the event’s
sender,room_id, and the recordedsession_idmatch a trusted session". The vulnerable matrix-sdk-crypto versions check that theroom_idmatches that of the session denoted bysession_id, but do not check thesender.Patches
The issue is resolved by 13c1d20, included in versions 0.11.1 and 0.12.0 of matrix-sdk-crypto.
Workarounds
Since a successful attack requires administrator access to the homeserver, users who trust the administrators of their local homeserver are not affected.
References
- https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2
- Database specific
{ "nvd_published_at": "2025-06-10T16:15:41Z", "cwe_ids": [ "CWE-290" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2025-06-10T20:15:37Z" }- 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
Affected packages
crates.io / matrix-sdk-crypto
Package
- Name
- matrix-sdk-crypto
- View open source insights on deps.dev
- Purl
- pkg:cargo/matrix-sdk-crypto