CVE-2026-56285

highCVSS 8.6covered by 1 sourcefirst seen 2026-06-29

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.

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Exploitation outlook

Low exploitation risk0.36% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-56285: Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains a…nvd · 2026-06-29

External references

NVD record for CVE-2026-56285

CVE.org record

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