CVE-2026-34227CWE-306CWE-942

Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface

Medium · published March 31, 2026

CVSS v4.0
5.9
EPSS
0%
Percentile
39.6
In the wild
Unconfirmed
What it is

Sliver is a command and control framework that uses a custom Wireguard netstack. Prior to version 1.7.4, a single click on a malicious link gives an unauthenticated attacker immediate, silent control over every active C2 session or beacon, capable of exfiltrating all collected target data (e.g. SSH keys, ntds.dit) or destroying the entire compromised infrastructure, entirely through the operator's own browser. This issue has been patched in version 1.7.4.

The record
Technical detail
CVSS v4.0
5.9 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N
EPSS
0.00469 · 39.6th percentile
Weaknesses
CWE-306 · Missing Authentication for Critical Function; CWE-942 · Permissive Cross-domain Security Policy with Untrusted Domains
Published
2026-03-31T15:25Z
EPSS history
Timeline
  • 31 MAR 15:25Z
    Sliver One-Click Remote Access: Insecure CORS & Unauthenticated MCP Interface
    cvelistv5