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CVE-2026-33645— Fireshare has Path Traversal Arbitrary File Write in `/api/uploadChunked`

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 1.5.1版本存在安全漏洞，该漏洞源于分块上传端点存在已认证的路径遍历，可能导致任意文件写入。

CVSS 7.1 · High EPSS 0.56% · P46

Possible ATT&CK Techniques 1 AI

T1105 · Ingress Tool Transfer
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I. Basic Information for CVE-2026-33645

Vulnerability Information
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Vulnerability Title
Fireshare has Path Traversal Arbitrary File Write in `/api/uploadChunked`
Source: CVE Program / CVE List V5
Vulnerability Description
Fireshare facilitates self-hosted media and link sharing. In version 1.5.1, an authenticated path traversal vulnerability in Fireshare’s chunked upload endpoint allows an attacker to write arbitrary files outside the intended upload directory. The `checkSum` multipart field is used directly in filesystem path construction without sanitization or containment checks. This enables unauthorized file writes to attacker-chosen paths writable by the Fireshare process (e.g., container `/tmp`), violating integrity and potentially enabling follow-on attacks depending on deployment. Version 1.5.2 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
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 安全漏洞
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 1.5.1版本存在安全漏洞，该漏洞源于分块上传端点存在已认证的路径遍历，可能导致任意文件写入。
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
ShaneIsrael fireshare = 1.5.2 -

II. Public POCs for CVE-2026-33645

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 6851 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-33645

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Vendor Advisories for CVE-2026-33645 (1)

Vendor Pages for CVE-2026-33645 (1)

IV. Related Vulnerabilities

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