CVE-2026-57862

HIGH 8.5

Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal IP Notation

CVSS Score

8.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-918
Vendor	kanboard
Product	kanboard
Published	Jul 30, 2026
Last Updated	Jul 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

Low

Availability

None

Affected Versions

Kanboard / Kanboard

0 < 1.2.52

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/kanboard/kanboard gist.github.com: https://gist.github.com/sermikr0/67c8acfc395e465127e729dc309da3ae vulncheck.com: https://www.vulncheck.com/advisories/kanboard-and-prior-ssrf-filter-bypass-via-hexadecimal-ip-notation

Credits

🔍 Saidakbarxon Maxsudxonov