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CVE-2026-34745— Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public

Quick assessment

Affected
ShaneIsrael fireshare
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Fireshare是Shane Israel个人开发者的一个媒体托管软件。 Fireshare 1.5.3之前版本存在路径遍历漏洞，该漏洞源于未经身份验证的/api/uploadChunked/public端点未应用修复，可能导致攻击者向服务器文件系统的任何可写路径写入任意文件。

CVSS 9.1 · Critical EPSS 0.72% · P53
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I. Basic Information for CVE-2026-34745

Vulnerability Information
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Vulnerability Title
Unauthenticated Path Traversal Arbitrary File Write in /api/uploadChunked/public
Source: CVE Program / CVE List V5
Vulnerability Description
Fireshare facilitates self-hosted media and link sharing. Prior to version 1.5.3, the fix for CVE-2026-33645 was applied to the authenticated /api/uploadChunked endpoint but was not applied to the unauthenticated /api/uploadChunked/public endpoint in the same file (app/server/fireshare/api.py). An unauthenticated attacker can exploit the checkSum parameter to write arbitrary files with attacker-controlled content to any writable path on the server filesystem. This issue has been patched in version 1.5.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Fireshare 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Fireshare是Shane Israel个人开发者的一个媒体托管软件。 Fireshare 1.5.3之前版本存在路径遍历漏洞，该漏洞源于未经身份验证的/api/uploadChunked/public端点未应用修复，可能导致攻击者向服务器文件系统的任何可写路径写入任意文件。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
ShaneIsrael fireshare < 1.5.3 -

II. Public POCs for CVE-2026-34745

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 15427 chars
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III. Intelligence Information for CVE-2026-34745

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Patches & Fixes for CVE-2026-34745 (3)

Vendor Advisories for CVE-2026-34745 (1)

IV. Related Vulnerabilities

Same product: fireshare
Same vendor: ShaneIsrael
Same weakness: CWE-22