Cyber Resilience

CVE-2026-8668

Published
18 June 2026
Modified
22 June 2026
CVSS Score v4 2.3
Click a component to see what it means
Raw vectorCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:L/SC:H/SI:N/SA:L/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:X/V:X/RE:L/U:X
EPSS Score 0.0027 19th percentile
Risk Priority 20 floored blend · peak EPSS

Summary

CVE-2026-8668 is a low-severity Unprotected Transport of Credentials (CWE-523) vulnerability in Chef (inferred from references). Its CVSS base score is 2.3 (Low).

Operationally, exploitation aligns with the MITRE ATT&CK technique Network Sniffing (T1040); ranked at the 19th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-8 (Transmission Confidentiality and Integrity) — see the control section below for these in your framework.

OWASP Top 10 for Web (2025)

A04:2025 Cryptographic Failures

EU & UK References

Vulnerability Data

A static credential embedded in Chef 360 prior to v1.7.0 permitted unauthenticated access to internal message queues.  Queue messages contained tenant-specific identifiers.  The credential has been rotated and replaced with per-tenant access in subsequent versions, eliminating this access method entirely.

CWE(s)
CWE-523

Related Threats

MITRE ATT&CK Enterprise Techniques

T1040 Network Sniffing Credential Access
Adversaries may passively sniff network traffic to capture information about an environment, including authentication material passed over the network.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2026-23635Shared CWE-523
CVE-2026-56587Shared CWE-523
CVE-2025-64309Shared CWE-523
CVE-2024-20395Shared CWE-523
CVE-2023-31277Shared CWE-523
CVE-2025-64308Shared CWE-523
CVE-2024-1509Shared CWE-523
CVE-2024-4188Shared CWE-523
CVE-2025-41705Shared CWE-523
CVE-2026-8673Shared CWE-523

Affected Assets

Chef
—
inferred from references and description; NVD did not file a CPE for this CVE

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)
  • 5 hardening rules · 3 OS baselines
Validate
Prove the fix (OWASP ASVS)

—

Mitigating Controls (NIST 800-53 r5) AI

SC-8 Transmission Confidentiality and Integrity good match

SC-8 requires confidentiality protection for transmitted data, directly stopping credentials from traveling in plaintext.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.DS-02 full match
prevents

Encryption of data-in-transit directly prevents exposure of credentials during login.

PR.AA-04 mostly match
prevents

Protecting identity assertions in transit covers credential transport but is narrower than the full control scope.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.24 Use of cryptography mostly match
prevents

Requires use of cryptography, directly enabling encryption of credentials in transit.

A.5.14 Information transfer partial match
prevents

Requires secure information transfer, which can include protecting credentials in transit.

A.5.17 Authentication information partial match
degrades

Addresses management of authentication information, indirectly supporting protection during transmission.

A.8.20 Networks security partial match
prevents

Requires network security controls that can protect credential transmission.

A.8.21 Security of network services partial match
prevents

Addresses security of network services, which may include protecting authentication traffic.

A.8.26 Application security requirements partial match
prevents

Specifies application security requirements that can include secure credential transmission.

Hardening callouts derived

Configuration rules from DISA STIG baselines that bear on weaknesses of the type cited by this CVE. Each rule is shown with the relationship its mapping actually records, against the CWE it was authored against. Derived via CVE→CWE over `controls_xwalks` (authoritative rows only; rows rated `none` are excluded).

RHEL 8 (2 rules)
  • V-230487 RHEL 8 must not have the telnet-server package installed. prevents CWE-523
  • V-230492 RHEL 8 must not have the rsh-server package installed. prevents CWE-523

References