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
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.005 (38.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 38.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Bishopfox Sliver — versions < 1.7.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/BishopFox/sliver/security/advisories/GHSA-6fpf-248c-m7wm (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.