CVE-2026-85676

MEDIUM 4.3

Dub Open Redirect via Unrestricted redir_url Parameter

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-601
Vendor	dubinc
Product	dub
Published	Sep 4, 2026
Last Updated	Sep 14, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

dubinc / dub

0 ≤ 73415cf5e6be13ce9adb7ba5e97474307db34a17

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/dubinc/dub/issues/4337 github.com: https://github.com/dubinc/dub github.com: https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts vulncheck.com: https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter

Credits

George Chen