CVE-2026-64941 Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR
Attackers can redirect users to malicious sites via crafted URLs containing hidden whitespace characters in Phoenix LiveView applications.
- 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
- Available
What is CVE-2026-64941?
CVE-2026-64941 is a low-severity vulnerability in phoenixframework phoenix_live_view, published on 10 Aug 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
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in phoenixframework phoenix_live_view allows an attacker to send a victim's browser to an origin of the attacker's choosing via a :to value containing ASCII tab, LF or CR.
redirect/2 validates :to through the private validate_local_url!/2 in lib/phoenix_live_view.ex, which is intended to guarantee the target is a path within the application. It rejects a leading // and any backslash, but not ASCII tab, LF or CR. Browsers strip those three characters before parsing a URL, so a value such as /<TAB>/example.com passes validation as a path and is then resolved as the scheme-relative URL //example.com. The live navigation functions share the guard but are not affected, because the client expands their target against the current origin. push_patch/2 is also affected before 0.7.0, which is when that expansion was added.
This issue affects phoenix_live_view: from 0.5.0 before 1.0.19, from 1.1.0-rc.0 before 1.1.33, and from 1.2.0-rc.0 before 1.2.9.
Weakness: CWE-601
Which versions are affected by CVE-2026-64941?
1 open source package ship an affected version, including phoenix_live_view.
| Package | Affected | Fixed in |
|---|---|---|
phoenix_live_view Hex | From 0.5.0 | 1.0.19, 1.1.33, 1.2.9 |
How do I fix CVE-2026-64941?
Upgrade phoenix_live_view to a fixed version for your release line: 1.0.19, 1.1.33 or 1.2.9.
Is CVE-2026-64941 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-64941 exists.
Sources
Also known as EEF-CVE-2026-64941, GHSA-36m4-rm57-3prf.