Vulnerability details

CVE-2026-57862

kanboard kanboard

Kanboard 1.2.52 and prior SSRF Filter Bypass via Hexadecimal IP Notation

CVSS 4.0

8.4High

Official 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.

CVSS scores

Score	Version	Source	Vector
8.4High	4.0	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N`
8.5High	3.1	CVEProject cvelistV5 (CNA) (VulnCheck)	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N`

Affected products

Vendor	Product	Versions	Source
kanboard	kanboard	v ≤ 1.2.52	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-07-30
Last updated: 2026-09-24
State: Published
Assigner (CNA): VulnCheck

Exploit prediction (EPSS)

0.41%

Probability of exploitation in 30 days

35.7%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: No
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (CWE)

CWE-918
Server-Side Request Forgery (SSRF)