Open redirect via stripped ASCII control characters
Published Aug 10, 2026 · Updated Aug 10, 2026
Open redirect in Phoenix LiveView allows remote attackers to send a victim's browser to an attacker-controlled origin through a crafted :to value. validate_local_url!/2 accepts a slash separated by an ASCII tab, LF, or CR from a second slash; the browser strips that character and interprets the result as a scheme-relative URL. Exploitation requires an application to pass externally influenced data to redirect/2 and a victim to follow the resulting navigation, enabling phishing or disclosure of data appended to the target.
Summary
What happened
Open redirect in Phoenix LiveView allows remote attackers to send a victim's browser to an attacker-controlled origin through a crafted :to value. validate_local_url!/2 accepts a slash separated by an ASCII tab, LF, or CR from a second slash; the browser strips that character and interprets the result as a scheme-relative URL. Exploitation requires an application to pass externally influenced data to redirect/2 and a victim to follow the resulting navigation, enabling phishing or disclosure of data appended to the target.
The record
- CVE
- CVE-2026-64941
- Published
- Aug 10, 2026
- Updated
- Aug 10, 2026
- Vendor
- Phoenix Framework
- Product
- Phoenix LiveView
- Classifications
- CWE-601, T1566.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 10, 2026CVE publishedPublication date reported by the CVE source.
- Aug 10, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.5.0 <1.0.19
- Affected versionversion=1.1.0-rc.0 <1.1.33
- Affected versionversion=1.2.0-rc.0 <1.2.9
- Affected versionversion=b20dba3f65a380b2e4868dae03397f13d2daa070 <* changes=[{"at":"0b8c733133466912f81adecaea72b6712370242e","status":"unaffected"},{"at":"1c164f83df0bb922dfff9c60d125da5b0cfd6619","status":"unaffected"},{"at":"2068b304d71907064b159b6bc60c5ad85a876ecf","status":"unaffected"}]
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream crafted :to value proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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