Cross-site scripting via unvalidated redirect URL
Published Feb 22, 2024 · Updated Mar 28, 2025
Universal cross-site scripting in Mozilla Firefox Focus before 123 allows remote attackers to run script in a victim site's context via a link. The WKNavigationDelegate path accepted a javascript: URL from a server-side 302 Location header without validating the redirected URL, so WebKit executed the payload under the previously visited page's origin. A victim must first visit a target site and then follow the attacker's link; successful exploitation lets the attacker read or alter content available to scripts in that site's origin.
Summary
What happened
Universal cross-site scripting in Mozilla Firefox Focus before 123 allows remote attackers to run script in a victim site's context via a link. The WKNavigationDelegate path accepted a javascript: URL from a server-side 302 Location header without validating the redirected URL, so WebKit executed the payload under the previously visited page's origin. A victim must first visit a target site and then follow the attacker's link; successful exploitation lets the attacker read or alter content available to scripts in that site's origin.
The record
- CVE
- CVE-2024-26284
- Published
- Feb 22, 2024
- Updated
- Mar 28, 2025
- Vendor
- Mozilla
- Product
- Firefox Focus
- Classifications
- CWE-79, T1189
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 22, 2024CVE publishedPublication date reported by the CVE source.
- Mar 28, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=unspecified <123
What conditions does exploitation require?
What is affected?
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
- 302 Location javascript URL proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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