CVE-2025-30354: bruno — Exploit & Fix

Description

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.

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CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Weakness Type (CWE)

CWE-942 CWE-942

Affected Products

Vendor	Product	Versions
usebruno	bruno	< 1.39.1

References

Advisories & Patches

https://github.com/usebruno/bruno/security/advisories/GHSA-hffg-7v8v-79j3

Exploits

https://github.com/usebruno/bruno/security/advisories/GHSA-hffg-7v8v-79j3

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2025-30354? +

CVE-2025-30354 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-30354? +

CVE-2025-30354 affects products from usebruno, specifically: bruno. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-30354? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2025-30354