PatchSiren cyber security CVE debrief
CVE-2026-57862 Kanboard CVE debrief
The CVE-2026-57862 record indicates a server-side request forgery (SSRF) vulnerability in Kanboard 1.2.52 and prior. The vulnerability allows authenticated users to bypass SSRF protections by supplying hexadecimal IP address notation in user-controlled URLs through the web link creation feature. The cURL library resolves and connects to internal network resources such as cloud instance metadata services, localhost services, and RFC1918 addresses. 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. Limited information is available about the scope of affected systems and vendor remediation efforts. Affected Kanboard users should verify their installations and review compensating controls. The CVE record was published on 2026-07-30T16:17:14.607Z and has not been modified since then.
- Vendor
- Kanboard
- Product
- Kanboard
- CVSS
- HIGH 8.4
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-07-30
- Original CVE updated
- 2026-07-31
- Advisory published
- 2026-07-30
- Advisory updated
- 2026-07-31
Who should care
Kanboard users and administrators, security teams monitoring for SSRF vulnerabilities, and teams responsible for internal network resource protection should review and verify their installations for version 1.2.52 and prior. They should also restrict user input in URL creation features to prevent hexadecimal IP address notation and implement additional SSRF protections and filters for internal network resources. Monitoring for suspicious URL creation activity from authenticated users is also recommended.
Technical summary
The Kanboard application, version 1.2.52 and prior, contains a server-side request forgery (SSRF) vulnerability. The vulnerability allows authenticated users to bypass SSRF protections by supplying hexadecimal IP address notation in user-controlled URLs through the web link creation feature. The cURL library resolves and connects to internal network resources such as cloud instance metadata services, localhost services, and RFC1918 addresses. 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.
Defensive priority
Authenticated users with low privileges can bypass SSRF protections by supplying hexadecimal IP address notation in user-controlled URLs, potentially allowing access to internal network resources.
Recommended defensive actions
- Inventory and verify Kanboard installations for version 1.2.52 and prior.
- Restrict user input in URL creation features to prevent hexadecimal IP address notation.
- Implement additional SSRF protections and filters for internal network resources.
- Monitor for suspicious URL creation activity from authenticated users.
- Consider compensating controls such as IP address whitelisting for internal resources.
Evidence notes
The CVE-2026-57862 record indicates a server-side request forgery vulnerability in Kanboard 1.2.52 and prior. The vulnerability allows authenticated users to bypass SSRF protections by supplying hexadecimal IP address notation in user-controlled URLs. 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. Limited information is available about the scope of affected systems and vendor remediation efforts.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-30T16:17:14.607Z and has not been modified since then.