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CVE-2026-82238— filebrowser 2.24.0 Race Condition via TUS concurrent PATCH uploads

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是File Browser组织的一款文件浏览管理软件。 File Browser 2.24.0及之后版本存在竞争条件问题漏洞，该漏洞源于TUS上传处理程序存在竞争条件，允许已认证用户通过发送并发PATCH请求绕过长度验证，写出超过声明的Upload-Length，可能导致文件超出声明大小并触发超大上传的完成钩子。

CVSS 3.1 · Low EPSS 0.21% · P11

Affected Version Matrix 1

VendorProduct Version RangeStatus
filebrowser filebrowser 2.24.0≤ 2.63.23 affected
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I. Basic Information for CVE-2026-82238

Vulnerability Information
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Vulnerability Title
filebrowser 2.24.0 Race Condition via TUS concurrent PATCH uploads
Source: CVE Program / CVE List V5
Vulnerability Description
filebrowser from version 2.24.0 contains a race condition in the TUS upload handler that allows authenticated users to write past the declared Upload-Length by sending concurrent PATCH requests. Attackers can send multiple simultaneous PATCH requests at the same offset to bypass length validation, resulting in files that exceed their declared size and triggering completion hooks for oversized uploads.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
File Browser 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
File Browser是File Browser组织的一款文件浏览管理软件。 File Browser 2.24.0及之后版本存在竞争条件问题漏洞，该漏洞源于TUS上传处理程序存在竞争条件，允许已认证用户通过发送并发PATCH请求绕过长度验证，写出超过声明的Upload-Length，可能导致文件超出声明大小并触发超大上传的完成钩子。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
filebrowser filebrowser 2.24.0 ~ 2.63.23 -

II. Public POCs for CVE-2026-82238

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III. Intelligence Information for CVE-2026-82238

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Vendor Advisories for CVE-2026-82238 (2)

Same Patch Batch · filebrowser · 2026-08-28 · 4 CVEs total

CVE-2026-82235 5.9 MEDIUM filebrowser through 2.63.23 Denial of Service via named pipes
CVE-2026-82237 3.1 LOW filebrowser through 2.63.23 Stale Share Link via File Rename
CVE-2026-82236 3.1 LOW File Browser 2.63.6 through 2.63.23 Share Link Exposure via File Deletion

IV. Related Vulnerabilities

Same product: filebrowser
Same vendor: filebrowser
Same weakness: CWE-367