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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.

PUBLISHED Reserved 2026-06-20 | Published 2026-06-29 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 7.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:H/SI:N/SA:N

HIGH: 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Problem types

Server-Side Request Forgery (SSRF)

Initialization of a Resource with an Insecure Default

Product status

Default status
unaffected

Any version before 44b2f096f67da2cc257a0e262a94a7ae79e95d47
affected

Credits

George Chen finder

References

github.com/zedeus/nitter/issues/1411 exploit

github.com/zedeus/nitter/issues/1411 (Researcher Disclosure) issue-tracking

github.com/...ommit/44b2f096f67da2cc257a0e262a94a7ae79e95d47 (Patch Commmit) patch

www.vulncheck.com/...t-forgery-in-video-media-proxy-endpoint third-party-advisory

cve.org (CVE-2026-56285)

nvd.nist.gov (CVE-2026-56285)

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