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 responses from any host reachable by the server, including cloud metadata services and internal network resources.

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.004 (28.6th percentile) — read the EPSS interpretation.

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)

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.