CVE-2026-85676 Dub Open Redirect via Unrestricted redir_url Parameter
Attackers can redirect users to malicious sites via Dub short links by exploiting an unvalidated redir_url parameter, enabling phishing attacks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-85676?
CVE-2026-85676 is a medium-severity vulnerability in dubinc dub, published on 4 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-601
Which versions are affected by CVE-2026-85676?
How do I fix CVE-2026-85676?
No fix has been published for CVE-2026-85676 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-85676 being exploited?
There is no known exploitation of CVE-2026-85676 in the wild and no public exploit code.
Sources
Also known as GHSA-vpv7-5wp2-c8xx.