# CVE-2026-68507: ideon: Unauthenticated /api/links/preview endpoint is an open SSRF relay, and its IP blocklist misses the 0.0.0.0/:: unspecified-address bypass

Status: published. Published: 2026-11-11. Updated: 2026-11-13.

ideon is a self-hosted visual workspace. Prior to version 0.9.5, ideon's link-preview endpoint requires no authentication at all and forwards any URL a caller supplies straight into a server-side fetch. The app does have a general-purpose SSRF guard (safeFetch/validateSafeUrl in src/app/lib/ssrf.ts), but this route sits behind no login check whatsoever, making it a fully open, anonymous URL-fetch relay - and the guard's IP blocklist itself has a gap that lets it reach the server's own loopback interface via the 0.0.0.0 "any address" bypass, a well-documented SSRF-filter evasion technique on Linux. This issue has been patched in version 0.9.5.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- 3xpyth0n / ideon: < 0.9.5 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X; source: NVD: security-advisories@github.com

- CISA KEV: No listing in collected sources

- EPSS: 0.51% as of 2026-11-13; percentile 43.76%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-306, CWE-918

## Exploit evidence

- exploit: https://github.com/3xpyth0n/ideon/security/advisories/GHSA-vpc2-r395-534p (ADP: CISA-ADP)

## References

- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-vpc2-r395-534p (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.5 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-vpc2-r395-534p (ADP: CISA-ADP; exploit)

- https://github.com/3xpyth0n/ideon/releases/tag/v0.9.5 (security-advisories@github.com)

- https://github.com/3xpyth0n/ideon/security/advisories/GHSA-vpc2-r395-534p (security-advisories@github.com)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-68507; retrieved 2026-11-13; source updated 2026-11-13

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68507; retrieved 2026-11-13; source updated 2026-11-12

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-68507; retrieved 2026-11-13; source updated Not reported

Revision: b5a19ca86643057f125c699726fb3443776bdd823619cf7427f86a1855e2f273

Canonical: https://y2.dev/cve/CVE-2026-68507

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