Open Redirect in Busy
CVE-2026-2709
A flaw has been found in busy up to 2.5.5. The affected element is an unknown function of the file source-code/busy-master/src/server/app.js of the component Callback Handler. Executing a manipulation of the argument state can lead to open redirect. It is possible to launch the attack remotely. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
Vulnerability class: Open Redirect
EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N.
Affected products
- N/a Busy — versions 2.5.0, 2.5.1, 2.5.2
Weakness classification (CWE)
References
- cna@vuldb.com (technical-description, vdb-entry)
- cna@vuldb.com (signature, permissions-required)
- cna@vuldb.com (third-party-advisory)
- cna@vuldb.com (issue-tracking)
- cna@vuldb.com (issue-tracking, exploit)
Frequently asked questions
- What is CVE-2026-2709?
- CVE-2026-2709 is a low-severity vulnerability in Busy, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 3.5/10. Published 2026-02-19.
- How severe is CVE-2026-2709?
- Low severity. CVSS v3 base score is 3.5 out of 10.