RUSTSEC-2025-0041 (CVE-2025-48937)

Vulnerability from osv_rustsec – Published: 2025-06-11 12:00 – Updated: 2026-10-12 17:47 – Source website
VLAI
Summary
matrix-sdk-crypto vulnerable to encrypted event sender spoofing by homeserver administrator
Details

matrix-sdk-crypto versions 0.8.0 up to and including 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.

Severity
4.9 (Medium)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "categories": [],
        "cvss": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
        "informational": null
      },
      "ecosystem_specific": {
        "affected_functions": null,
        "affects": {
          "arch": [],
          "functions": [],
          "os": []
        }
      },
      "package": {
        "ecosystem": "crates.io",
        "name": "matrix-sdk-crypto",
        "purl": "pkg:cargo/matrix-sdk-crypto"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.8.0"
            },
            {
              "fixed": "0.11.1"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": []
    }
  ],
  "aliases": [
    "CVE-2025-48937",
    "GHSA-x958-rvg6-956w"
  ],
  "database_specific": {
    "license": "CC0-1.0"
  },
  "details": "matrix-sdk-crypto versions 0.8.0 up to and including 0.11.0 does not correctly validate\nthe sender of an encrypted event. Accordingly, a malicious homeserver operator\ncan modify events served to clients, making those events appear to the recipient\nas 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\nconsider this a High severity security issue.",
  "id": "RUSTSEC-2025-0041",
  "modified": "2026-10-12T17:47:59Z",
  "published": "2025-06-11T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://crates.io/crates/matrix-sdk-crypto"
    },
    {
      "type": "ADVISORY",
      "url": "https://rustsec.org/advisories/RUSTSEC-2025-0041.html"
    },
    {
      "type": "WEB",
      "url": "https://github.com/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55"
    }
  ],
  "related": [],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "matrix-sdk-crypto vulnerable to encrypted event sender spoofing by homeserver administrator"
}



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