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CVE-2026-57862— Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal IP Notation

Quick assessment

Affected
Kanboard Kanboard
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.

Kanboard是Kanboard团队开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.52及之前版本存在服务端请求伪造漏洞，该漏洞源于用户控制的URL中提供十六进制IP地址表示法导致绕过SSRF保护，可能导致服务器端请求伪造，允许攻击者访问内部网络资源。

CVSS 8.5 · High EPSS 0.41% · P33

Affected Version Matrix 1

VendorProduct Version RangeStatus
Kanboard Kanboard ≤ 1.2.52 affected
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I. Basic Information for CVE-2026-57862

Vulnerability Information
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Vulnerability Title
Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal IP Notation
Source: CVE Program / CVE List V5
Vulnerability Description
Kanboard 1.2.52 and prior contains a server-side request forgery vulnerability that allows authenticated users to bypass SSRF protections by supplying hexadecimal IP address notation in user-controlled URLs. Attackers can submit hexadecimal-encoded internal IP addresses through the web link creation feature, causing cURL to resolve and connect to internal network resources such as cloud instance metadata services, localhost services, and RFC1918 addresses while the isPrivateURL() filter in app/Core/Http/Client.php incorrectly treats the input as safe due to FILTER_VALIDATE_IP rejecting non-dotted-decimal notation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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
Kanboard 服务端请求伪造漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Kanboard是Kanboard团队开源的一套开源的可视化任务板软件。该软件能够根据业务定制面板。 Kanboard 1.2.52及之前版本存在服务端请求伪造漏洞，该漏洞源于用户控制的URL中提供十六进制IP地址表示法导致绕过SSRF保护，可能导致服务器端请求伪造，允许攻击者访问内部网络资源。
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
Kanboard Kanboard 0 ~ 1.2.52 -

II. Public POCs for CVE-2026-57862

# 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.
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 · 8532 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-57862

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Vendor Advisories for CVE-2026-57862 (1)

Proof of Concept for CVE-2026-57862 (1)

Vendor Pages for CVE-2026-57862 (1)

IV. Related Vulnerabilities

Same product: Kanboard
Same vendor: Kanboard
Same weakness: CWE-918

V. Comments for CVE-2026-57862

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