CVE-2026-56285

Summary

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 Software

Weaknesses

• CWE-918: Server-Side Request Forgery (SSRF)
• CWE-1188: Initialization of a Resource with an Insecure Default

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: partial

Additional References

• https://github.com/zedeus/nitter/issues/1411

References

• https://github.com/zedeus/nitter/issues/1411
• https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47
• https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint

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