Restricted-host access via URL userinfo confusion
Published May 3, 2025 · Updated May 5, 2025
Improper URL authorization in Browser Use before 0.1.45 allows remote attackers to bypass allowed_domains and reach blocked hosts. The _is_url_allowed method truncates the parsed authority at the first colon, treating a permitted username as the domain instead of checking the actual hostname. Exploitation requires allowed_domains to protect the session and attacker-controlled navigation input; success permits browsing to localhost or internal services.
Summary
What happened
Improper URL authorization in Browser Use before 0.1.45 allows remote attackers to bypass allowed_domains and reach blocked hosts. The _is_url_allowed method truncates the parsed authority at the first colon, treating a permitted username as the domain instead of checking the actual hostname. Exploitation requires allowed_domains to protect the session and attacker-controlled navigation input; success permits browsing to localhost or internal services.
The record
- CVE
- CVE-2025-47241
- Published
- May 3, 2025
- Updated
- May 5, 2025
- Vendor
- Browser Use
- Product
- Browser Use
- Classifications
- CWE-647
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 3, 2025CVE publishedPublication date reported by the CVE source.
- May 5, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <0.1.45
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
- Upstream allowed_domains bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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