What is CVE-2026-85676?

CVE-2026-85676 is a medium-severity vulnerability, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-09-04.

How severe is CVE-2026-85676?

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

CVE-2026-85676

CVE-2026-85676

Dub contains an open redirect vulnerability in the redir_url query parameter that is accepted on every short link without validation or domain allowlist enforcement. Attackers can append the redir_url parameter to any short link to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks with link cloaking enabled.

Vulnerability class: Open Redirect

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.

Weakness classification (CWE)

CWE-601 — URL Redirection to Untrusted Site (Open Redirect)

References

disclosure@vulncheck.com
disclosure@vulncheck.com
disclosure@vulncheck.com
disclosure@vulncheck.com

Frequently asked questions

What is CVE-2026-85676?: CVE-2026-85676 is a medium-severity vulnerability, classified under URL Redirection to Untrusted Site (Open Redirect). CVSS score: 4.3/10. Published 2026-09-04.
How severe is CVE-2026-85676?: Medium severity. CVSS v3 base score is 4.3 out of 10.