What’s Vulnerable › Vulnerabilities

CVE-2026-28508: Idno: Unauthenticated SSRF via URL Unfurl Endpoint

• Severity: high (CVSS 8.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-918

Description

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.

Affected products

• idno known: before 1.6.4 — fixed in 1.6.4

How to fix

Upgrade to a fixed version: idno known 1.6.4. Check the vendor advisory for mitigations.

References

• https://github.com/idno/idno/releases/tag/1.6.4
• https://github.com/idno/idno/security/advisories/GHSA-fcrh-fqxh-6fx6

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