CVE-2025-48937 json
matrix-sdk-crypto vulnerable to sender of encrypted events being spoofed by homeserver administrator
published 2025-06-10 16 mo ago modified 2026-10-12 27 d ago also EUVD-2025-17711 , GHSA-x958-rvg6-956w , RUSTSEC-2025-0041
- cvss
- 4.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 32%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- crates.io matrix-sdk-crypto 0.11.1
- matrix matrix-rust-sdk 0.11.1
- fractal openSUSE Tumbleweed 11.2-1.1
opensuse advisories openSUSE-SU-2025:15218-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 16 mo ago
Exploit prediction
0.39% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| GitHub | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
| OSV | 3.1 | 4.9 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | matrix-sdk-crypto | >=0.8.0, <0.11.1 |
0.11.1 |
Affected products
- matrix-org matrix-rust-sdk
Classification
- Weakness
-
- CWE-290 Authentication Bypass by Spoofing
References
-
github.com
/matrix-org/matrix-rust-sdk/commit/13c1d2048286bbabf5e7bc6b015aafee98f04d55
web
-
github.com
/matrix-org/matrix-rust-sdk/commit/56980745b4f27f7dc72ac296e6aa003e5d92a75b
web
-
github.com
/matrix-org/matrix-rust-sdk/security/advisories/GHSA-x958-rvg6-956w
web
-
spec.matrix.org
/v1.14/client-server-api/#mmegolmv1aes-sha2
web
-
nvd.nist.gov
/vuln/detail/CVE-2025-48937
advisory
-
github.com
/matrix-org/matrix-rust-sdk
package
-
rustsec.org
/advisories/RUSTSEC-2025-0041.html
web, advisory
-
crates.io
/crates/matrix-sdk-crypto
package
Sources
- CVE List CVE-2025-48937
- GitHub Advisory GHSA-x958-rvg6-956w
- NVD CVE-2025-48937
- OSV RUSTSEC-2025-0041
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.