VULNERABILITY INTELLIGENCE
CVE-2026-56285
CVSS score8.6 HIGH
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-06-29
Last modified2026-10-25
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
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.
Weakness classification
- disclosure@vulncheck.com: CWE-918