Vulnerability in Edgelesssys Contrast
CVE-2026-100835
Contrast before 1.16.0 is susceptible to remote attestation relay attacks. Contrast accepted any TEE attestation report that verified correctly and contained the expected firmware patch levels and software measurements, regardless of which machine produced it, so attestation was not bound to specific, physically trusted hardware. An attacker who can both intercept network traffic between the CLI and the Coordinator (or between the Coordinator and an attested component) and forge reports or extract secrets from any single TEE machine under their physical control can relay such a report to impersonate a Contrast Coordinator or a Contrast workload, defeating identity verification in Contrast's attested TLS (aTLS).
Vulnerability class: Improper Certificate Validation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (20.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 20.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- GitHub Security Advisory (GHSA-hjgc-jc5v-fw7h) (vendor-advisory)
- VulnCheck Advisory: Contrast before 1.16.0 Remote Attestation Relay Attack (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100835?
- CVE-2026-100835 is a high-severity vulnerability in Edgelesssys Contrast, classified under Improper Certificate Validation. CVSS score: 7.4/10. Published 2026-09-27.
- How severe is CVE-2026-100835?
- High severity. CVSS v3 base score is 7.4 out of 10.
- Is CVE-2026-100835 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.