CVE-2026-64941: Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR

Severity: low (CVSS 2.1 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-10-24
Weakness: CWE-601

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.

Affected products

phoenixframework phoenix_live_view: from 0.5.0 before 1.0.19; from 1.1.0-rc.0 before 1.1.33; from 1.2.0-rc.0 before 1.2.9 — fixed in 1.0.19, 1.1.33, 1.2.9

How to fix

Upgrade to a fixed version: phoenixframework phoenix_live_view 1.0.19, 1.1.33, 1.2.9. Check the vendor advisory for mitigations.

References

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