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CVE-2026-73243— kkFileView: Unauthenticated SSRF via /addTask with fullfilename type-confusion bypass

Quick assessment

Affected
kekingcn kkFileView
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.

kekingcn kkFileView是kekingcn组织的一款文件预览中间件。 kekingcn kkFileView 5.0.1之前版本存在服务端请求伪造漏洞，该漏洞源于/addTask端点未经过TrustHostFilter和TrustDirFilter过滤，且FileHandlerService#getFileAttribute使用fullfilename参数强制类型，导致可获取攻击者选择的URL，容易受到服务端请求伪造攻击。

CVSS 5.8 · Medium EPSS 0.43% · P35

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
kekingcn kkFileView < 5.0.1 affected
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I. Basic Information for CVE-2026-73243

Vulnerability Information
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Vulnerability Title
kkFileView: Unauthenticated SSRF via /addTask with fullfilename type-confusion bypass
Source: CVE Program / CVE List V5
Vulnerability Description
kkFileView is a universal file online preview project based on Spring Boot. Prior to 5.0.1, the unauthenticated GET /addTask endpoint in kkFileView is omitted from TrustHostFilter and TrustDirFilter in server/src/main/java/cn/keking/config/WebConfig.java, allowing FileConvertQueueTask to fetch an attacker-selected URL after FileHandlerService#getFileAttribute uses the fullfilename parameter to force an OFFICE, COMPRESS, or CAD type. This issue is fixed in version 5.0.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5
Vulnerability Title
kekingcn kkFileView 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kekingcn kkFileView是kekingcn组织的一款文件预览中间件。 kekingcn kkFileView 5.0.1之前版本存在服务端请求伪造漏洞，该漏洞源于/addTask端点未经过TrustHostFilter和TrustDirFilter过滤，且FileHandlerService#getFileAttribute使用fullfilename参数强制类型，导致可获取攻击者选择的URL，容易受到服务端请求伪造攻击。
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
kekingcn kkFileView < 5.0.1 -

II. Public POCs for CVE-2026-73243

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: SSRF via unauthenticated /addTask — kkFileView (kv) fetched http://attacker:8080/flag.txt; served file carries PROOF_2506e3b249844b2b
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
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claude_code · 4393 chars
GitHub 复现环境（可 clone 直接跑）
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III. Intelligence Information for CVE-2026-73243

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Patches & Fixes for CVE-2026-73243 (3)

Vendor Advisories for CVE-2026-73243 (1)

Vendor Pages for CVE-2026-73243 (1)

IV. Related Vulnerabilities

Same product: kkFileView
Same vendor: kekingcn
Same weakness: CWE-918

V. Comments for CVE-2026-73243

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