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CVE-2026-32255— Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint

Quick assessment

Affected
kanbn kan
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.

kan是kanbn开源的一个开源项目管理工具。 Kan 0.5.4及之前版本存在代码问题漏洞，该漏洞源于/api/download/attatchment端点缺少身份验证和URL验证，可能导致未经身份验证的攻击者从服务器发起HTTP请求。

CVSS 8.6 · High EPSS 1.74% · P77

Public Exploits 1

Nuclei · 1 CVE-2026-32255.yaml [template]
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I. Basic Information for CVE-2026-32255

Vulnerability Information
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Vulnerability Title
Kan is Vulnerable to Unauthenticated SSRF via Attachment Download Endpoint
Source: CVE Program / CVE List V5
Vulnerability Description
Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body. An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/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
kan 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
kan是kanbn开源的一个开源项目管理工具。 Kan 0.5.4及之前版本存在代码问题漏洞，该漏洞源于/api/download/attatchment端点缺少身份验证和URL验证，可能导致未经身份验证的攻击者从服务器发起HTTP请求。
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
kanbn kan < 0.5.5 -

II. Public POCs for CVE-2026-32255

# POC Description Source Link Shenlong Link
1 Kan, an open-source project management tool (Trello alternative), versions 0.5.4 and below are vulnerable to an unauthenticated Server-Side Request Forgery in the /api/download/attatchment endpoint. The endpoint passes the attacker-controlled `url` query parameter straight to a server-side fetch() without validating the destination host, allowing an unauthenticated attacker to make the server issue arbitrary outbound HTTP requests and read back the full response body. https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-32255.yaml POC Details
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III. Intelligence Information for CVE-2026-32255

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Patches & Fixes for CVE-2026-32255 (1)

Vendor Advisories for CVE-2026-32255 (1)

Vendor Pages for CVE-2026-32255 (1)

IV. Related Vulnerabilities

Same product: kan
Same vendor: kanbn
Same weakness: CWE-918

V. Comments for CVE-2026-32255

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