4.9

CVE-2025-48937: matrix-org matrix-rust-sdk Authentication Bypass by Spoofing

CVSS: 4.9v3.1MediumDeferred
AliasesopenSUSE-SU-2025:15218-1GHSA-x958-rvg6-956wRUSTSEC-2025-0041
Published 10-06-2025Last modified 10-06-2025
Open JSON

Vulnerability summary

CVE-2025-48937 is a medium (CVSS 4.9) Authentication Bypass by Spoofing vulnerability in matrix-org matrix-rust-sdk. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 29.2% of scored vulnerabilities.

Overall risk
20/100
0100
Low · default modelHow is this calculated?
CVSS score
4.9/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.37%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-06-2025
    PublishedVulnerability first disclosed.
  2. 10-06-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.37%

Chance of exploitation in the next 30 days

Percentile

29%

Versus all other CVEs

30-day change

0.00 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.37%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Crates.Io1 product
  • matrix-sdk-crypto≥ 0.8.0, < 0.11.1
Matrix-org1 product
Opensuse1 product
  • fractal&distro=openSUSE Tumbleweed< 11.2-1.1

3 vendors · 3 products

References

9 links