CVE-2026-85676CWE-601

CVE-2026-85676

Medium · published September 4, 2026

CVSS v3.1
4.3
EPSS
0%
Percentile
35.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.3 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CVSS v4.0
5.3 · 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
EPSS
0.00422 · 35.5th percentile
Weakness
CWE-601 · URL Redirection to Untrusted Site ('Open Redirect')
Published
2026-09-04T19:17Z
References (4)
https://github.com/dubinc/dub · [email protected]https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts · [email protected]https://github.com/dubinc/dub/issues/4337 · [email protected]https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter · [email protected]
EPSS history
Timeline
  • 06 SEP 03:33Z
    EPSS moved — → 0%
    epss
  • 04 SEP 14:32Z
    Dub Open Redirect via Unrestricted redir_url Parameter
    cvelistv5