CVE-2026-64941

Summary

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 Software

VendorProductVersion RangeStatus
phoenixframeworkphoenix_live_view0.5.0 < 1.0.19affected
phoenixframeworkphoenix_live_view1.1.0-rc.0 < 1.1.33affected
phoenixframeworkphoenix_live_view1.2.0-rc.0 < 1.2.9affected
phoenixframeworkphoenix_live_viewb20dba3f65a380b2e4868dae03397f13d2daa070 < *affected

Weaknesses

  • CWE-601: CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Workarounds

Reject any untrusted value containing ASCII tab, LF or CR before passing it as :to to redirect/2, or to push_patch/2 before 0.7.0. Alternatively, map client-supplied navigation targets to a fixed set of known-good paths rather than forwarding the value.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: no
    • Technical Impact: partial

Additional References

References