An unsafe remote resource fetching vulnerability existed in MISP Modules expansion modules. The htmltomarkdown module accepted arbitrary HTTP(S) URLs without sufficient validation, which could allow Server-Side Request Forgery against loopback, private, or link-local network resources. Additionally, the qrcode module disabled TLS certificate verification when retrieving remote images, exposing requests to potential man-in-the-middle interception or response tampering. The issue was fixed by validating URL schemes, blocking local and private address ranges, resolving hostnames before fetching, enforcing request timeouts, and re-enabling TLS certificate verification. As reported by Bilal Teke.
{
"github_reviewed_at": "2026-05-06T22:31:03Z",
"nvd_published_at": "2026-05-13T20:16:23Z",
"cwe_ids": [
"CWE-295",
"CWE-918"
],
"severity": "MODERATE",
"github_reviewed": true
}