What is CVE-2026-49143?

CVE-2026-49143 is a high-severity vulnerability in Browserstack Browserstack-runner, classified under Code Injection. CVSS score: 8.8/10. Published 2026-06-02.

How severe is CVE-2026-49143?

High severity. CVSS v3 base score is 8.8 out of 10.

RCE in Browserstack Browserstack-runner

CVE-2026-49143

BrowserStack Runner through 0.9.5 contains a remote code execution vulnerability in the /_log HTTP handler that allows unauthenticated network-adjacent attackers to execute arbitrary code by submitting crafted JSON request bodies to the ha…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.002 (35.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Browserstack Browserstack-runner — versions 0

Weakness classification (CWE)

CWE-94 — Code Injection

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-49143?: CVE-2026-49143 is a high-severity vulnerability in Browserstack Browserstack-runner, classified under Code Injection. CVSS score: 8.8/10. Published 2026-06-02.
How severe is CVE-2026-49143?: High severity. CVSS v3 base score is 8.8 out of 10.