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CVE-2026-90930— File Browser through 2.63.23 Path Traversal via Symlink Alias

Quick assessment

Affected
filebrowser filebrowser
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

File Browser 2.63.23 及更早版本对请求的字典路径应用了路径规则，但在解析符号链接时未重新对目标路径应用规则，这使得经过身份验证的用户可以绕过“禁止”规则。攻击者可以通过作用域内的符号链接别名访问被禁止的路径，从而读取或覆盖被规则拒绝的文件。

CVSS 6.8 · Medium

Possible ATT&CK Techniques 1 AI

T1531.001
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I. Basic Information for CVE-2026-90930

Vulnerability Information
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Vulnerability Title
File Browser through 2.63.23 Path Traversal via Symlink Alias
Source: CVE Program / CVE List V5
Vulnerability Description
File Browser through 2.63.23 applies path rules to the requested lexical path but resolves symbolic links without reapplying rules to the target, allowing authenticated users to bypass deny rules. Attackers can read and overwrite rule-denied files by accessing them through in-scope symbolic link aliases that resolve to denied paths.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在文件访问前对链接解析不恰当(链接跟随)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
filebrowser filebrowser 0 ~ 2.63.23 -

II. Public POCs for CVE-2026-90930

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III. Intelligence Information for CVE-2026-90930

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Vendor Advisories for CVE-2026-90930 (2)

Same Patch Batch · filebrowser · 2026-09-14 · 4 CVEs total

CVE-2026-90929 8.1 HIGH File Browser 2.5.0 Directory Deletion via Upload Failure Cleanup
CVE-2026-90927 6.5 MEDIUM filebrowser through 2.63.23 Denial of Service via unbounded WebSocket message
CVE-2026-90928 6.5 MEDIUM File Browser through 2.63.23 Memory Exhaustion via subtitle endpoint

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-59

V. Comments for CVE-2026-90930

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