Read the docs
TI-2026-26522 Aliases CVE-2026-34227GHSA-6fpf-248c-m7wm

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

Priority MEDIUM 60CWE-306Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Active
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
High · Low · Low
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-306.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00411 35th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed sliver (BishopFox): 1.7.4github.com/bishopfox/sliver (Go): 1.7.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
BishopFoxsliverbefore 1.7.41.7.4Patch availableCNA
—github.com/bishopfox/sliver (Go)before 1.7.41.7.4Patch availableGHSA-6fpf-248c-m7wm
  • sliver VendorBishopFox Affected before 1.7.4 Fixed in 1.7.4 Patch available CNA
  • github.com/bishopfox/sliver (Go) Vendor— Affected before 1.7.4 Fixed in 1.7.4 Patch available GHSA-6fpf-248c-m7wm

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:*before 1.7.4VulnerableBishopFox
  • cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:* Versions before 1.7.4 Vulnerable ·BishopFox

Remediation

  • Fix · CNA sliver (BishopFox) Fixed in 1.7.4
  • Fix · GHSA-6fpf-248c-m7wm github.com/bishopfox/sliver (Go) Fixed in 1.7.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-34227
  2. 2026-10-03 Alias added: GHSA-6fpf-248c-m7wm

References

Exploit 1

Advisory 1

Other 1

  • TI-2025-19960 Server-Side Request Forgery (SSRF) in sliver teamserver CVSS 4.0MEDIUM 6.9
  • TI-2023-17391 Sliver from v1.5.x to v1.5.39 has an improper cryptographic implementation, which allows… CVSS 3.1HIGH 8.1
  • TI-2026-25389 Sliver Vulnerable to Authenticated OOM via Memory Exhaustion in mTLS/WireGuard Transports CVSS 4.0MEDIUM 5.7
  • TI-2026-23367 Sliver: Authenticated Nil-Pointer Dereference in Handlers CVSS 4.0LOW 2.1
  • TI-2026-20855 Sliver has a DNS C2 OTP Bypass Allows Unauthenticated Session Flooding and Denial of Service CVSS 3.1HIGH 7.5
  • TI-2026-20827 Website Path Traversal / Arbitrary File Read (Authenticated) in Sliver CVSS 3.1MEDIUM 6.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences