CVE-2026-56285

HIGH

Nitter - Server-Side Request Forgery in /video Media Proxy Endpoint

Title source: cna

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.

References (3)

Core 3

Core References

Issue Tracking issue-tracking

Researcher Disclosure

https://github.com/zedeus/nitter/issues/1411

Patch patch

Patch Commmit

https://github.com/zedeus/nitter/commit/44b2f096f67da2cc257a0e262a94a7ae79e95d47

View Patch ZIP pw:eip

Third Party Advisory third-party-advisory

https://www.vulncheck.com/advisories/nitter-server-side-request-forgery-in-video-media-proxy-endpoint

Scores

CVSS v3 8.6

EPSS 0.0036

EPSS Percentile 28.1%

Attack Vector NETWORK

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

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

CWE

CWE-1188 CWE-918

Status published

Products (1)

zedeus/nitter < 44b2f096f67da2cc257a0e262a94a7ae79e95d47

Published Jun 29, 2026

Tracked Since Jun 29, 2026