SSRF in Idno
CVE-2026-28508
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.
Vulnerability class: SSRF (Server-Side Request Forgery)
EPSS: 0.006 (46.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.
Affected products
- Idno — versions < 1.6.4
- Withknown Known
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Mitigation, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, Release Notes)
Frequently asked questions
- What is CVE-2026-28508?
- CVE-2026-28508 is a high-severity vulnerability in Idno, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-03-06.
- How severe is CVE-2026-28508?
- High severity. CVSS v3 base score is 8.6 out of 10.