What is CVE-2025-30354?

CVE-2025-30354 is a medium-severity vulnerability in Usebruno Bruno, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 4.3/10. Published 2025-04-01.

How severe is CVE-2025-30354?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Usebruno Bruno

CVE-2025-30354

Bruno is an open source IDE for exploring and testing APIs. A bug in the assertion runtime caused assert expressions to run in Developer Mode, even if Safe Mode was selected. The bug resulted in the sandbox settings to be ignored for the particular case where a single request is run/sent. This vulnerability's attack surface is limited strictly to scenarios where users import collections from untrusted or malicious sources. The exploit requires deliberate action from the user—specifically, downloading and opening an externally provided malicious Bruno collection. The vulnerability is fixed in 1.39.1.

EPSS: 0.004 (28.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.

Affected products

Usebruno Bruno — versions < 1.39.1

Weakness classification (CWE)

CWE-942 — Permissive Cross-domain Policy with Untrusted Domains

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2025-30354?: CVE-2025-30354 is a medium-severity vulnerability in Usebruno Bruno, classified under Permissive Cross-domain Policy with Untrusted Domains. CVSS score: 4.3/10. Published 2025-04-01.
How severe is CVE-2025-30354?: Medium severity. CVSS v3 base score is 4.3 out of 10.