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

Quick assessment

Affected
phoenixframework phoenix_live_view
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Phoenix framework Phoenix LiveView是Phoenix framework组织的一款实时交互式Web应用开发框架。 Phoenix framework Phoenix LiveView 0.5.0版本至1.0.19之前版本、1.1.0-rc.0版本至1.1.33之前版本和1.2.0-rc.0版本至1.2.9之前版本存在输入验证错误漏洞，该漏洞源于对:to参数验证不当，未过滤ASCII制表符、换行符或回车符，可能导致攻击者将受害者的浏览器重定向到攻击者选择的来源。

CVSS 2.1 · Low EPSS 0.60% · P47

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise

Affected Version Matrix 4

VendorProduct Version RangeStatus
phoenixframework phoenix_live_view 0.5.0< 1.0.19 affected
1.1.0-rc.0< 1.1.33 affected
1.2.0-rc.0< 1.2.9 affected
b20dba3f65a380b2e4868dae03397f13d2daa070< * affected
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I. Basic Information for CVE-2026-64941

Vulnerability Information
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Vulnerability Title
Open redirect in Phoenix.LiveView.validate_local_url!/2 via ASCII tab, LF and CR
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
Source: CVE Program / CVE List V5
Vulnerability Title
Phoenix framework Phoenix LiveView 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Phoenix framework Phoenix LiveView是Phoenix framework组织的一款实时交互式Web应用开发框架。 Phoenix framework Phoenix LiveView 0.5.0版本至1.0.19之前版本、1.1.0-rc.0版本至1.1.33之前版本和1.2.0-rc.0版本至1.2.9之前版本存在输入验证错误漏洞，该漏洞源于对:to参数验证不当，未过滤ASCII制表符、换行符或回车符，可能导致攻击者将受害者的浏览器重定向到攻击者选择的来源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
phoenixframework phoenix_live_view 0.5.0 ~ 1.0.19 cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*
phoenixframework phoenix_live_view b20dba3f65a380b2e4868dae03397f13d2daa070 ~ * cpe:2.3:a:phoenixframework:phoenix_live_view:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-64941

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III. Intelligence Information for CVE-2026-64941

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Patches & Fixes for CVE-2026-64941 (3)

Vendor Advisories for CVE-2026-64941 (2)

News Coverage for CVE-2026-64941 (1)

IV. Related Vulnerabilities

Same product: phoenix_live_view
Same vendor: phoenixframework
Same weakness: CWE-601

V. Comments for CVE-2026-64941

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