File Browser: Authentication Bypass via Proxy Auth Header Forgery
CVSS score
—
EPSS probability
%0.6
Risk score
—
Published
3 mo ago
Unfortunately, there is no solution available yet.
Impact on My Inventory
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Vulnerability description
DayBreach CVE AI Research
CVE-2026-54089 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.
When FileBrowser is configured with proxy authentication (`auth.method=proxy`), any unauthenticated attacker who can reach the server directly can impersonate **any user - including admin** - by sending a single forged HTTP header. No credentials are required. Additionally, specifying a non-existent username causes the server to **automatically create a new user account**, providing an account creation primitive with no authorization. **This is an already known issue that has been documented in the documentation for several years, but has not been documented as a vulnerability before.**
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-54089 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | go | github.com/filebrowser/filebrowser/v2 | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
Resmî yama doğrulanamadı; geçici azaltım veya workaround mevcut.
Unfortunately, there is no solution available yet.
Unfortunately, there is no solution available yet.
Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-54089 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-54089 weaknesses.
Official Sources and Advisories
Similar Vulnerabilities
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