CVE-2026-56285
HIGH
NVD
CVSS Score
8.6
Severity
HIGH
Published
Jun 29, 2026
Vendor
unknown
Description
Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP responses from any host reachable by the server, including cloud metadata services and internal network resources.