What is CVE-2026-57862?

CVE-2026-57862 is a high-severity vulnerability in Kanboard, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-07-30.

How severe is CVE-2026-57862?

High severity. CVSS v3 base score is 8.5 out of 10.

SSRF in Kanboard

CVE-2026-57862

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.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.003 (21.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N.

Affected products

Kanboard — versions 0

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

Product Repository (product)
GitHub Gist (technical-description)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-57862?: CVE-2026-57862 is a high-severity vulnerability in Kanboard, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.5/10. Published 2026-07-30.
How severe is CVE-2026-57862?: High severity. CVSS v3 base score is 8.5 out of 10.