Auth bypass in Bishopfox Sliver
CVE-2026-34227
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.
Vulnerability class: Broken Authentication
EPSS: 0.004 (32.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Bishopfox Sliver — versions < 1.7.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-34227?
- CVE-2026-34227 is a high-severity vulnerability in Bishopfox Sliver, classified under Missing Authentication for Critical Function. CVSS score: 8.8/10. Published 2026-03-31.
- How severe is CVE-2026-34227?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2026-34227 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.