Vulnerability · Published Jun 29, 2026 · Assigned by VulnCheck
CVE-2026-56285Nitter - Server-Side Request Forgery in /video Media Proxy Endpoint
High 8.6
In plain English
A high-severity server-side request forgery in nitter from zedeus. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities).
Severity (CVSS 3.1)8.6High
Exploit odds (30 days)0.5%top 59.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
Weakness: CWE-918, CWE-1188 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
References
- Researcher Disclosure issue-tracking
- Patch Commmit patch
- https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint third-party-advisory