---
id: CVE-2026-84696
title: >-
  Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose
  privileged vendor unique commands over the ATA interface with absent or
  defeatable authentication mechanisms
summary: >-
  Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose
  privileged vendor unique commands over the ATA interface with absent or
  defeatable authentication mechanisms. Attackers can bypass the weak CRC-16
  based unlock handsh…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-306
published: '2026-09-02'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:47:22.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84696'
references:
  - url: 'https://github.com/trulycrisp/disksec'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/trulycrisp/psychite'
    label: disclosure@vulncheck.com
  - url: 'https://trulycrisp.github.io/drivefirmware/phison_s11/'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-authentication-on-vendor-unique-commands
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00149
epssPercentile: 0.04474
ingestedAt: '2026-09-10T15:53:17.040Z'
---

## Overview

Phison PS3111-S11 controller firmware versions through SBFQT1.3 expose privileged vendor unique commands over the ATA interface with absent or defeatable authentication mechanisms. Attackers can bypass the weak CRC-16 based unlock handshake or exploit builds with no VUC lock to read and write controller memory and raw flash, persisting implants across power cycles.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.