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CVE-2026-64941 phoenixframework CVE debrief

The CVE-2026-64941 vulnerability is classified as a URL Redirection to Untrusted Site (Open Redirect) issue within the phoenix_live_view library. This vulnerability allows an attacker to redirect a victim's browser to an arbitrary URL by exploiting a weakness in the validation of the :to value in the redirect/2 function. The validation mechanism fails to properly handle ASCII tab, LF, or CR characters, which are subsequently stripped by browsers before URL parsing. Consequently, an attacker can bypass validation and redirect the victim to a malicious site. The affected versions of phoenix_live_view are 0.5.0 to 1.0.18, 1.1.0-rc.0 to 1.1.32, and 1.2.0-rc.0 to 1.2.8. Users of these versions should review and apply patches. Additionally, operators, platform administrators, vulnerability management teams, and security teams responsible for these applications should assess their exposure and take appropriate defensive actions. Further review of source references and vendor remediation is needed to fully understand the scope and impact. Defenders should verify the presence of affected versions in their environments and review vendor patches for applicability. This issue has a low CVSS score of 2.1, indicating a low-priority defensive review due to the limited attack surface. However, it is crucial to confirm whether affected product deployments exist in managed environments and assign an owner for follow-up. Reviewing the supplied official advisory or CVE record can help validate the affected scope, severity, and vendor guidance. Planning vendor-supported updates or mitigations through normal change control is recommended where exposure is confirmed.

Vendor
phoenixframework
Product
phoenix_live_view
CVSS
LOW 2.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-10
Original CVE updated
2026-08-10
Advisory published
2026-08-10
Advisory updated
2026-08-10

Who should care

Users of phoenix_live_view library versions 0.5.0 to 1.0.18, 1.1.0-rc.0 to 1.1.32, and 1.2.0-rc.0 to 1.2.8 should review and apply patches. Additionally, operators, platform administrators, vulnerability management teams, and security teams responsible for these applications should assess their exposure and take appropriate defensive actions.

Technical summary

The phoenix_live_view library has a URL Redirection to Untrusted Site vulnerability. An attacker can redirect a victim's browser to an arbitrary URL by exploiting the :to value validation weakness in the redirect/2 function. This issue arises because the validation mechanism does not properly handle ASCII tab, LF, or CR characters, which are stripped by browsers before URL parsing. As a result, an attacker can bypass validation and redirect the victim to a malicious site.

Defensive priority

Low-priority defensive review recommended due to limited attack surface and low CVSS score.

Recommended defensive actions

  • Review and apply vendor patches for phoenix_live_view versions 0.5.0 to 1.0.18, 1.1.0-rc.0 to 1.1.32, and 1.2.0-rc.0 to 1.2.8
  • Monitor and restrict incoming traffic to phoenix_live_view applications
  • Perform inventory checks for affected phoenix_live_view versions
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The evidence for CVE-2026-64941 is limited, primarily based on official CVE and NVD records. The vulnerability affects phoenix_live_view versions 0.5.0 to 1.0.18, 1.1.0-rc.0 to 1.1.32, and 1.2.0-rc.0 to 1.2.8. Further review of source references and vendor remediation is needed to fully understand the scope and impact. Defenders should verify the presence of affected versions in their environments and review vendor patches for applicability.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-10T12:17:19.873Z and has not been modified since then.