CVE-2026-85676
Dub Open Redirect via Unrestricted redir_url Parameter
- State
- Published
- Severity
- 5.3 Medium
- Published
- Sep 4, 2026
- Updated
- Sep 14, 2026
- Reserved
- Sep 4, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N | VulnCheck |
Weaknesses
- CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
Affected Products
| Product | Versions |
|---|---|
dubdubinc |
|
References
- GitHub Issue #4337issue-tracking
- https://github.com/dubinc/dubproduct
- https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.tstechnical-description
- VulnCheck Advisory: Dub Open Redirect via Unrestricted redir_url Parameterthird-party-advisory
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