CVE-2026-56285
Nitter's /video media proxy endpoint fails to validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key, allowing
CVSS
8.6
High
EPSS
0.4%
p28
KEV
—
Exploit Today
8
0-100
Published: Jun 29, 2026 · Last modified: Jul 14, 2026 · CWE-918 · CWE-1188
0.4%EPSS · 30 days0.4%
2026-06-302026-07-16
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.
- github.comhttps://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47
- github.comhttps://github.com/zedeus/nitter/issues/1411
- www.vulncheck.comhttps://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint
- github.comhttps://github.com/zedeus/nitter/issues/1411
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-202308.6 HIG98.5%
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