CVE-2026-56285 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in Nitter's video media proxy endpoint. This issue arises because the endpoint does not validate target URLs against Twitter/X domains and uses a hardcoded default HMAC key. As a result, unauthenticated attackers can compute valid HMACs for arbitrary URLs and retrieve HTTP responses from any host reachable by the Nitter server. This includes access to cloud metadata services and internal network resources.
Users are advised to update their Nitter configuration to use a unique, random HMAC key, replacing the default 'secretkey' value. This change will prevent the forgery of HMAC signatures for the video proxy endpoint.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 29, 2026CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/zedeus/nitter/issues/1411 | CISA-ADP | ExploitIssue TrackingTechnical DescriptionVendor |
| https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47 | [email protected] | Source CodeVendor |
| https://github.com/zedeus/nitter/issues/1411 | [email protected] | ExploitIssue TrackingTechnical DescriptionVendor |
| https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint | [email protected] | AdvisoryRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1188 | Initialization of a Resource with an Insecure Default | [email protected] |
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Nitter | < commit 44b2f09 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 14, 2026 | CVE Modified | [email protected] |
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 29, 2026 | New CVE Received | [email protected] |