Auth bypass in Cobbr Covenant
CVE-2026-92717
Covenant through 0.6 registers the CovenantHub SignalR hub without an Authorize attribute, allowing unauthenticated callers to invoke CreateHttpListener and receive a signed JWT token. Attackers can use the obtained token to authenticate against the entire operator API and access grunts, credentials, binaries, events, and the operator roster.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (42.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/cobbr/Covenant/issues/406 (issue-tracking)
- github.com/cobbr/Covenant (product)
- github.com/cobbr/Covenant/blob/v0.6/Covenant/Hubs/CovenantHub.cs (technical-description)
- github.com/cobbr/Covenant/blob/v0.6/Covenant/Core/CovenantService.cs (technical-description)
- www.vulncheck.com/advisories/covenant-through-0.6-missing-authentication-on-the… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-92717?
- CVE-2026-92717 is a critical-severity vulnerability in Cobbr Covenant, classified under Missing Authentication for Critical Function. CVSS score: 9.1/10. Published 2026-09-16.
- How severe is CVE-2026-92717?
- Critical severity. CVSS v3 base score is 9.1 out of 10.