CVE-2026-28508
HIGH
GHSA-fcrh-fqxh-6fx6
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Lifecycle Timeline
3Description
Idno is a social publishing platform. Prior to version 1.6.4, a logic error in the API authentication flow causes the CSRF protection on the URL unfurl service endpoint to be trivially bypassed by any unauthenticated remote attacker. Combined with the absence of a login requirement on the endpoint itself, this allows an attacker to force the server to make arbitrary outbound HTTP requests to any host, including internal network addresses and cloud instance metadata services, and retrieve the response content. This issue has been patched in version 1.6.4.
Analysis
Idno prior to version 1.6.4 contains an authentication bypass in the URL unfurl API endpoint that allows unauthenticated attackers to trigger arbitrary outbound HTTP requests from the server. An attacker can exploit this to access internal network addresses and cloud metadata services, potentially exposing sensitive configuration and credentials. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Implement egress filtering and URL validation for server-side requests.
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External POC / Exploit Code
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