CVE-2026-84696

Description

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.

CVSS Metrics

• v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
• v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X
• v3.1•HIGH•Score: 8.2CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Techniques & Countermeasures

• CWE-306•Missing Authentication for Critical Function

  The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

Affected Systems

• phison electronics corporation•ps3111-s11 controller firmware

  SBFQT1.3

References (4)

• https://trulycrisp.github.io/drivefirmware/phison_s11/
• https://github.com/trulycrisp/psychite
• https://github.com/trulycrisp/disksec
• https://www.vulncheck.com/advisories/phison-ps3111-s11-controller-firmware-missing-authentication-on-vendor-unique-commands