CVE-2026-84696

Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commands

State: Published
Severity: 9.3 Critical
Published: Sep 2, 2026
Updated: Sep 2, 2026
Reserved: Sep 1, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	VulnCheck
3.1	8.2 High	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H	VulnCheck

Weaknesses

CWE-306 Missing Authentication for Critical Function

Affected Products

Product	Versions
PS3111-S11 Controller FirmwarePhison Electronics Corporation	SBFQT1.3Affected

References

https://trulycrisp.github.io/drivefirmware/phison_s11/technical-description
https://github.com/trulycrisp/psychiteexploit
https://github.com/trulycrisp/disksecexploit
VulnCheck Advisory: Phison PS3111-S11 Controller Firmware Missing Authentication on Vendor Unique Commandsthird-party-advisory

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