CVE Catalog

CVE-2026-56285

HighCVSS 8.6
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.36%

28th percentile - higher than 28% of all known CVEs

Summary

A vulnerability in Nitter allows unauthenticated attackers to use the /video media proxy endpoint to send HTTP requests to arbitrary hosts, including internal network resources and cloud metadata services. The issue stems from missing validation of target URLs against Twitter/X domains and the use of a hardcoded default HMAC key.

Risk Assessment

An attacker can access sensitive data from internal servers, such as cloud instance metadata, potentially leading to leakage of credentials or configuration information.

Recommendation

Immediately update Nitter to the latest version that fixes this vulnerability, and configure firewalls to restrict access to the media proxy endpoint to trusted IP addresses only.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS