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CVE-2025-48937
matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator
Medium4.9EPSS 0.39%
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
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. This vulnerability is fixed in 0.11.1 and 0.12.0.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| NVDNVD · Deferred | 3.1 | Medium4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 0.39% · top 67% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
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The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.9.
Weakness
Affected products
- affected >= 0.8.0, < 0.11.1
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- crates.iomatrix-sdk-cryptoGHSA-x958-rvg6-956w (opens in a new tab)
References (4)
- https://github.com/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w (opens in a new tab)x_refsource_CONFIRM
- https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55 (opens in a new tab)x_refsource_MISC
- https://github.com/matrix-org/matrix-rust-sdk/commit/56980745b4f27f7dc72ac296e6aa003e5d92a75b (opens in a new tab)x_refsource_MISC
- https://spec.matrix.org/v1.14/client-server-api/#mmegolmv1aes-sha2 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-x958-rvg6-956w (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2025-48937)Record last updated .