Authenticated account takeover via case-sensitive password-field validation
Published Feb 9, 2026 · Updated Feb 9, 2026
Authentication bypass in File Browser before 2.57.1 allows remote authenticated users to change an account password without verification. The userPutHandler compares requested fields with a case-sensitive lowercase map, then accepts the Title Case Password field during update processing. A valid JWT and default JSON authentication are required; the bypass converts a stolen session into persistent control of that account and can lock out its holder.
Summary
What happened
Authentication bypass in File Browser before 2.57.1 allows remote authenticated users to change an account password without verification. The userPutHandler compares requested fields with a case-sensitive lowercase map, then accepts the Title Case Password field during update processing. A valid JWT and default JSON authentication are required; the bypass converts a stolen session into persistent control of that account and can lock out its holder.
The record
- CVE
- CVE-2026-25889
- Published
- Feb 9, 2026
- Updated
- Feb 9, 2026
- Vendor
- File Browser Contributors
- Product
- File Browser
- Classifications
- CWE-178, T1098
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 9, 2026CVE publishedPublication date reported by the CVE source.
- Feb 9, 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=< 2.57.1
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.
Public exploit references
- GHSA-hxw8-4h9j-hq2r password-update PoCproof of concept · demonstrated
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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