CVE-2026-34227

Description

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.

CVSS Details

CVSS Score

8.8

Severity

HIGH

CVSS Vector

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

Configurations (Affected Products)

cpe:2.3:a:bishopfox:sliver:*:*:*:*:*:*:*:* - VULNERABLE

Sliver < 1.7.4

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

<!--
PoC for CVE-2026-34227 (Conceptual)
This demonstrates how a malicious link could trigger the vulnerability.
-->
<html>
<body>
<h1>Sliver C2 Session Hijack PoC</h1>
<!--
In a real exploit scenario, the 'href' would contain a payload
targeting the Sliver operator's browser or protocol handler.
-->
<a href="sliver://exploit/callback?cmd=exfiltrate_all">Click here to claim reward</a>

<script>
// Hypothetical JavaScript payload if XSS is the vector
console.log('Attempting to interact with Sliver C2 local API...');
// fetch('http://localhost:31337/api/sessions', { method: 'GET' })
//   .then(response => response.json())
//   .then(data => console.log('Exfiltrated Sessions:', data));
</script>
</body>
</html>

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-34227
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-34227
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-34227/
[4] VulDB https://vuldb.com/cve/CVE-2026-34227
[5] https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm
[6] https://github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm

Raw JSON Data

JSON

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