What is CVE-2026-56285?

CVE-2026-56285 is a high-severity vulnerability in Zedeus Nitter, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-06-29.

How severe is CVE-2026-56285?

High severity. CVSS v3 base score is 8.6 out of 10.

RCE in Zedeus Nitter

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 unauthenticated attackers to compute valid HMACs for arbitrary URLs. Attackers can retrieve HTTP r…

Vulnerability class: SSRF (Server-Side Request Forgery)

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N.

Affected products

Zedeus Nitter — versions 0

Weakness classification (CWE)

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

References

disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (issue-tracking)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-56285?: CVE-2026-56285 is a high-severity vulnerability in Zedeus Nitter, classified under Server-Side Request Forgery (SSRF). CVSS score: 8.6/10. Published 2026-06-29.
How severe is CVE-2026-56285?: High severity. CVSS v3 base score is 8.6 out of 10.